Clipping of imported meshes by the near and far view planes.
A straightforward clipping algorithm was implemented to eliminate vertices that are out of the interval from the near to far clipping distance defined by the active camera. Previously, objects that come behind the camera could lead to a crash. The changes in this commit is intended to address this issue. When meshes are partially clipped, new edges are added. These edges can result in visible strokes if they are within the camera view.
This commit is contained in:
@@ -1,17 +1,19 @@
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#include "BlenderFileLoader.h"
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#include <assert.h>
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BlenderFileLoader::BlenderFileLoader(Render *re, SceneRenderLayer* srl)
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{
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_re = re;
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_srl = srl;
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_Scene = NULL;
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_numFacesRead = 0;
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_minEdgeSize = DBL_MAX;
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_Scene = NULL;
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_numFacesRead = 0;
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_minEdgeSize = DBL_MAX;
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}
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BlenderFileLoader::~BlenderFileLoader()
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{
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_Scene = NULL;
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_Scene = NULL;
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}
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NodeGroup* BlenderFileLoader::Load()
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@@ -28,8 +30,8 @@ NodeGroup* BlenderFileLoader::Load()
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_viewplane_right= _re->viewplane.xmax;
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_viewplane_bottom= _re->viewplane.ymin;
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_viewplane_top= _re->viewplane.ymax;
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_z_near= _re->clipsta;
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_z_far= _re->clipend;
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_z_near= -_re->clipsta;
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_z_far= -_re->clipend;
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#if 0
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cout << "frustrum: l " << _viewplane_left << " r " << _viewplane_right
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<< " b " << _viewplane_bottom << " t " << _viewplane_top
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@@ -53,23 +55,164 @@ NodeGroup* BlenderFileLoader::Load()
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return _Scene;
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}
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#define CLIPPED_BY_NEAR -1
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#define NOT_CLIPPED 0
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#define CLIPPED_BY_FAR 1
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// check if each vertex of a triangle (V1, V2, V3) is clipped by the near/far plane
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// and calculate the number of triangles to be generated by clipping
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int BlenderFileLoader::countClippedFaces(VertRen *v1, VertRen *v2, VertRen *v3, int clip[3])
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{
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VertRen *v[3];
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int numClipped, sum, numTris;
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v[0] = v1;
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v[1] = v2;
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v[2] = v3;
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numClipped = sum = 0;
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for (int i = 0; i < 3; i++) {
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if (v[i]->co[2] > _z_near) {
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clip[i] = CLIPPED_BY_NEAR;
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numClipped++;
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} else if (v[i]->co[2] < _z_far) {
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clip[i] = CLIPPED_BY_FAR;
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numClipped++;
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} else {
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clip[i] = NOT_CLIPPED;
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}
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// printf("%d %s\n", i, (clip[i] == NOT_CLIPPED) ? "not" : (clip[i] == CLIPPED_BY_NEAR) ? "near" : "far");
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sum += clip[i];
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}
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switch (numClipped) {
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case 0:
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numTris = 1; // triangle
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break;
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case 1:
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numTris = 2; // tetragon
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break;
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case 2:
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if (sum == 0)
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numTris = 3; // pentagon
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else
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numTris = 1; // triangle
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break;
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case 3:
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if (sum == 3 || sum == -3)
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numTris = 0;
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else
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numTris = 2; // tetragon
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break;
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}
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return numTris;
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}
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// find the intersection point C between the line segment from V1 to V2 and
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// a clipping plane at depth Z (i.e., the Z component of C is known, while
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// the X and Y components are unknown).
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void BlenderFileLoader::clipLine(VertRen *v1, VertRen *v2, float c[3], float z)
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{
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double d[3];
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for (int i = 0; i < 3; i++)
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d[i] = v2->co[i] - v1->co[i];
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double t = (z - v1->co[2]) / d[2];
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c[0] = v1->co[0] + t * d[0];
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c[1] = v1->co[1] + t * d[1];
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c[2] = z;
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}
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// clip the triangle (V1, V2, V3) by the near and far clipping plane and
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// obtain a set of vertices after the clipping. The number of vertices
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// is at most 5.
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void BlenderFileLoader::clipTriangle(int numTris, float triCoords[][3], VertRen *v1, VertRen *v2, VertRen *v3, int clip[3])
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{
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VertRen *v[3];
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int i, j, k;
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v[0] = v1;
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v[1] = v2;
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v[2] = v3;
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k = 0;
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for (i = 0; i < 3; i++) {
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j = (i + 1) % 3;
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if (clip[i] == NOT_CLIPPED) {
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copy_v3_v3(triCoords[k++], v[i]->co);
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if (clip[j] != NOT_CLIPPED) {
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clipLine(v[i], v[j], triCoords[k++], (clip[j] == CLIPPED_BY_NEAR) ? _z_near : _z_far);
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}
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} else if (clip[i] != clip[j]) {
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if (clip[j] == NOT_CLIPPED) {
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clipLine(v[i], v[j], triCoords[k++], (clip[i] == CLIPPED_BY_NEAR) ? _z_near : _z_far);
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} else {
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clipLine(v[i], v[j], triCoords[k++], (clip[i] == CLIPPED_BY_NEAR) ? _z_near : _z_far);
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clipLine(v[i], v[j], triCoords[k++], (clip[j] == CLIPPED_BY_NEAR) ? _z_near : _z_far);
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}
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}
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}
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assert (k == 2 + numTris);
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}
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void BlenderFileLoader::addTriangle(struct LoaderState *ls, float v1[3], float v2[3], float v3[3])
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{
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float v12[3], v13[3], n[3];
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float *fv[3], len;
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unsigned i, j;
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// initialize the bounding box by the first vertex
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if (ls->currentIndex == 0) {
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copy_v3_v3(ls->minBBox, v1);
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copy_v3_v3(ls->maxBBox, v1);
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}
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// compute the normal of the triangle
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sub_v3_v3v3(v12, v1, v2);
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sub_v3_v3v3(v13, v1, v3);
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cross_v3_v3v3(n, v12, v13);
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normalize_v3(n);
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fv[0] = v1;
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fv[1] = v2;
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fv[2] = v3;
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for (i = 0; i < 3; i++) {
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copy_v3_v3(ls->pv, fv[i]);
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copy_v3_v3(ls->pn, n);
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// update the bounding box
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for (j = 0; j < 3; j++)
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{
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if (ls->minBBox[j] > ls->pv[j])
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ls->minBBox[j] = ls->pv[j];
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if (ls->maxBBox[j] < ls->pv[j])
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ls->maxBBox[j] = ls->pv[j];
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}
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len = len_v3v3(fv[i], fv[(i + 1) % 3]);
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if (_minEdgeSize > len)
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_minEdgeSize = len;
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*ls->pvi = ls->currentIndex;
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*ls->pni = ls->currentIndex;
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*ls->pmi = ls->currentMIndex;
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ls->currentIndex +=3;
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ls->pv += 3;
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ls->pn += 3;
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ls->pvi++;
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ls->pni++;
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ls->pmi++;
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}
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}
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void BlenderFileLoader::insertShapeNode(ObjectRen *obr, int id)
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{
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VlakRen *vlr;
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float minBBox[3];
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float maxBBox[3];
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NodeTransform *currentMesh = new NodeTransform;
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NodeShape * shape;
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VlakRen *vlr;
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// Mesh *mesh = (Mesh *)ob->data;
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//---------------------
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// mesh => obr
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// builds the shape:
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shape = new NodeShape;
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// We invert the matrix in order to be able to retrieve the shape's coordinates in its local coordinates system (origin is the iNode pivot)
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// Lib3dsMatrix M;
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// lib3ds_matrix_copy(M, mesh->matrix);
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@@ -86,20 +229,30 @@ void BlenderFileLoader::insertShapeNode(ObjectRen *obr, int id)
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// mesh_calc_normals(mesh->mvert, mesh->totvert, mesh->mface, mesh->totface, NULL);
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//---------------------
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// already calculated and availabe in vlak ?
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// printf("%s\n", obr->ob->id.name + 2);
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// We build the rep:
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IndexedFaceSet *rep;
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unsigned numFaces = 0;
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int clip_1[3], clip_2[3];
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for(int a=0; a < obr->totvlak; a++) {
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if((a & 255)==0) vlr= obr->vlaknodes[a>>8].vlak;
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else vlr++;
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if(vlr->v4)
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numFaces += 2;
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else
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numFaces++;
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// printf("v1 %f, %f, %f\n", vlr->v1->co[0], vlr->v1->co[1], vlr->v1->co[2]);
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// printf("v2 %f, %f, %f\n", vlr->v2->co[0], vlr->v2->co[1], vlr->v2->co[2]);
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// printf("v3 %f, %f, %f\n", vlr->v3->co[0], vlr->v3->co[1], vlr->v3->co[2]);
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// if (vlr->v4) printf("v4 %f, %f, %f\n", vlr->v4->co[0], vlr->v4->co[1], vlr->v4->co[2]);
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numFaces += countClippedFaces(vlr->v1, vlr->v2, vlr->v3, clip_1);
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if (vlr->v4)
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numFaces += countClippedFaces(vlr->v1, vlr->v3, vlr->v4, clip_2);
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}
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// cout <<"numFaces " <<numFaces<<endl;
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if (numFaces == 0)
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return;
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NodeTransform *currentMesh = new NodeTransform;
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NodeShape * shape = new NodeShape;
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unsigned vSize = 3*3*numFaces;
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float *vertices = new float[vSize];
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unsigned nSize = vSize;
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@@ -120,46 +273,35 @@ void BlenderFileLoader::insertShapeNode(ObjectRen *obr, int id)
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unsigned *NIndices = new unsigned[niSize];
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unsigned *MIndices = new unsigned[viSize]; // Material Indices
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float *pv = vertices;
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float *pn = normals;
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unsigned *pvi = VIndices;
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unsigned *pni = NIndices;
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unsigned *pmi = MIndices;
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unsigned currentIndex = 0;
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unsigned currentMIndex = 0;
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struct LoaderState ls;
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ls.pv = vertices;
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ls.pn = normals;
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ls.pvi = VIndices;
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ls.pni = NIndices;
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ls.pmi = MIndices;
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ls.currentIndex = 0;
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ls.currentMIndex = 0;
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FrsMaterial tmpMat;
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// we want to find the min and max coordinates as we build the rep.
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// We initialize the min and max values whith the first vertex.
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//lib3ds_vector_transform(pvtmp, M, mesh->pointL[mesh->faceL[0].points[0]].pos);
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float pvtmp[3];
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pvtmp[0] = obr->vertnodes[0].vert->co[0];
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pvtmp[1] = obr->vertnodes[0].vert->co[1];
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pvtmp[2] = obr->vertnodes[0].vert->co[2];
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mul_m4_v3( M, pvtmp);
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minBBox[0] = pvtmp[0];
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maxBBox[0] = pvtmp[0];
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minBBox[1] = pvtmp[1];
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maxBBox[1] = pvtmp[1];
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minBBox[2] = pvtmp[2];
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maxBBox[2] = pvtmp[2];
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int p;
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real vert[3][3];
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real norm;
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for(p=0; p < obr->totvlak; ++p) // we parse the faces of the mesh
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{
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VertRen * fv[3];
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// Lib3dsFace *f=&mesh->faceL[p];
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// Lib3dsMaterial *mat=0;
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// Lib3dsFace *f=&mesh->faceL[p];
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// Lib3dsMaterial *mat=0;
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if((p & 255)==0) vlr = obr->vlaknodes[p>>8].vlak;
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else vlr++;
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unsigned numTris_1, numTris_2;
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numTris_1 = countClippedFaces(vlr->v1, vlr->v2, vlr->v3, clip_1);
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numTris_2 = (vlr->v4) ? countClippedFaces(vlr->v1, vlr->v3, vlr->v4, clip_2) : 0;
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if (numTris_1 == 0 && numTris_2 == 0)
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continue;
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Material *mat = vlr->mat;
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if (mat)
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@@ -185,7 +327,7 @@ void BlenderFileLoader::insertShapeNode(ObjectRen *obr, int id)
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it!=itend;
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++it){
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if(*it == tmpMat){
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currentMIndex = i;
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ls.currentMIndex = i;
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found = true;
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break;
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}
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@@ -194,171 +336,35 @@ void BlenderFileLoader::insertShapeNode(ObjectRen *obr, int id)
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if(!found){
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meshFrsMaterials.push_back(tmpMat);
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currentMIndex = meshFrsMaterials.size()-1;
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ls.currentMIndex = meshFrsMaterials.size()-1;
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}
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}
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unsigned j;
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fv[0] = vlr->v1;
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fv[1] = vlr->v2;
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fv[2] = vlr->v3;
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float *pv_ptr[3];
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for(i=0; i<3; ++i) // we parse the vertices of the face f
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{
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//lib3ds_vector_transform(pv, M, mesh->pointL[f->points[i]].pos); //fills the cells of the pv array
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for(j=0; j<3; j++)
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pv[j] = fv[i]->co[j];
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mul_m4_v3( M, pv);
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for(j=0; j<3; j++) // we parse the xyz coordinates of the vertex i
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{
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if(minBBox[j] > pv[j])
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minBBox[j] = pv[j];
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if(maxBBox[j] < pv[j])
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maxBBox[j] = pv[j];
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vert[i][j] = pv[j];
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float triCoords[5][3];
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if (numTris_1 > 0) {
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clipTriangle(numTris_1, triCoords, vlr->v1, vlr->v2, vlr->v3, clip_1);
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for (i = 0; i < 2 + numTris_1; i++) {
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mul_m4_v3(M, triCoords[i]); // camera to world
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// printf("%d %f, %f, %f\n", i, triCoords[i][0], triCoords[i][1], triCoords[i][2]);
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}
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for (i = 0; i < numTris_1; i++) {
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addTriangle(&ls, triCoords[0], triCoords[i+1], triCoords[i+2]);
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_numFacesRead++;
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}
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pv_ptr[i] = pv;
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*pvi = currentIndex;
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*pmi = currentMIndex;
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currentIndex +=3;
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pv += 3;
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pvi++;
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pmi++;
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}
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currentIndex -= 9;
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float vec01[3];
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vec01[0] = pv_ptr[1][0] - pv_ptr[0][0];
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vec01[1] = pv_ptr[1][1] - pv_ptr[0][1];
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vec01[2] = pv_ptr[1][2] - pv_ptr[0][2];
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float vec02[3];
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vec02[0] = pv_ptr[2][0] - pv_ptr[0][0];
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vec02[1] = pv_ptr[2][1] - pv_ptr[0][1];
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vec02[2] = pv_ptr[2][2] - pv_ptr[0][2];
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float n[3];
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cross_v3_v3v3(n, vec01, vec02);
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normalize_v3(n);
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for(i=0; i<3; ++i) {
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for(j=0; j<3; ++j) {
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pn[j] = n[j];
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if (numTris_2 > 0) {
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clipTriangle(numTris_2, triCoords, vlr->v1, vlr->v3, vlr->v4, clip_2);
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for (i = 0; i < 2 + numTris_2; i++) {
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mul_m4_v3(M, triCoords[i]); // camera to world
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// printf("%d %f, %f, %f\n", i, triCoords[i][0], triCoords[i][1], triCoords[i][2]);
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}
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for (i = 0; i < numTris_2; i++) {
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addTriangle(&ls, triCoords[0], triCoords[i+1], triCoords[i+2]);
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_numFacesRead++;
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}
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*pni = currentIndex;
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pn += 3;
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pni++;
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currentIndex +=3;
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}
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for(i=0; i<3; i++)
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{
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norm = 0.0;
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for (unsigned j = 0; j < 3; j++)
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norm += (vert[i][j] - vert[(i+1)%3][j])*(vert[i][j] - vert[(i+1)%3][j]);
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norm = sqrt(norm);
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if(_minEdgeSize > norm)
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_minEdgeSize = norm;
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}
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++_numFacesRead;
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if(vlr->v4){
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unsigned j;
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fv[0] = vlr->v1;
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fv[1] = vlr->v3;
|
||||
fv[2] = vlr->v4;
|
||||
float *pv_ptr[3];
|
||||
for(i=0; i<3; ++i) // we parse the vertices of the face f
|
||||
{
|
||||
|
||||
//lib3ds_vector_transform(pv, M, mesh->pointL[f->points[i]].pos); //fills the cells of the pv array
|
||||
for(j=0; j<3; j++)
|
||||
pv[j] = fv[i]->co[j];
|
||||
mul_m4_v3( M, pv);
|
||||
|
||||
for(j=0; j<3; j++) // we parse the xyz coordinates of the vertex i
|
||||
{
|
||||
if(minBBox[j] > pv[j])
|
||||
minBBox[j] = pv[j];
|
||||
|
||||
if(maxBBox[j] < pv[j])
|
||||
maxBBox[j] = pv[j];
|
||||
|
||||
vert[i][j] = pv[j];
|
||||
}
|
||||
|
||||
pv_ptr[i] = pv;
|
||||
*pvi = currentIndex;
|
||||
*pmi = currentMIndex;
|
||||
|
||||
currentIndex +=3;
|
||||
pv += 3;
|
||||
|
||||
pvi++;
|
||||
pmi++;
|
||||
}
|
||||
|
||||
currentIndex -= 9;
|
||||
|
||||
float vec01[3];
|
||||
vec01[0] = pv_ptr[1][0] - pv_ptr[0][0];
|
||||
vec01[1] = pv_ptr[1][1] - pv_ptr[0][1];
|
||||
vec01[2] = pv_ptr[1][2] - pv_ptr[0][2];
|
||||
|
||||
float vec02[3];
|
||||
vec02[0] = pv_ptr[2][0] - pv_ptr[0][0];
|
||||
vec02[1] = pv_ptr[2][1] - pv_ptr[0][1];
|
||||
vec02[2] = pv_ptr[2][2] - pv_ptr[0][2];
|
||||
|
||||
float n[3];
|
||||
cross_v3_v3v3(n, vec01, vec02);
|
||||
normalize_v3(n);
|
||||
|
||||
for(i=0; i<3; ++i) {
|
||||
for(j=0; j<3; ++j) {
|
||||
pn[j] = n[j];
|
||||
}
|
||||
*pni = currentIndex;
|
||||
|
||||
pn += 3;
|
||||
pni++;
|
||||
|
||||
currentIndex +=3;
|
||||
}
|
||||
|
||||
for(i=0; i<3; i++)
|
||||
{
|
||||
norm = 0.0;
|
||||
|
||||
for (unsigned j = 0; j < 3; j++)
|
||||
norm += (vert[i][j] - vert[(i+1)%3][j])*(vert[i][j] - vert[(i+1)%3][j]);
|
||||
|
||||
norm = sqrt(norm);
|
||||
if(_minEdgeSize > norm)
|
||||
_minEdgeSize = norm;
|
||||
}
|
||||
|
||||
++_numFacesRead;
|
||||
|
||||
|
||||
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
// We might have several times the same vertex. We want a clean
|
||||
@@ -413,8 +419,8 @@ void BlenderFileLoader::insertShapeNode(ObjectRen *obr, int id)
|
||||
// sets the id of the rep
|
||||
rep->setId(Id(id, 0));
|
||||
|
||||
const BBox<Vec3r> bbox = BBox<Vec3r>(Vec3r(minBBox[0], minBBox[1], minBBox[2]),
|
||||
Vec3r(maxBBox[0], maxBBox[1], maxBBox[2]));
|
||||
const BBox<Vec3r> bbox = BBox<Vec3r>(Vec3r(ls.minBBox[0], ls.minBBox[1], ls.minBBox[2]),
|
||||
Vec3r(ls.maxBBox[0], ls.maxBBox[1], ls.maxBBox[2]));
|
||||
rep->setBBox(bbox);
|
||||
shape->AddRep(rep);
|
||||
|
||||
|
||||
@@ -33,6 +33,18 @@ extern "C" {
|
||||
|
||||
class NodeGroup;
|
||||
|
||||
struct LoaderState {
|
||||
float *pv;
|
||||
float *pn;
|
||||
unsigned *pvi;
|
||||
unsigned *pni;
|
||||
unsigned *pmi;
|
||||
unsigned currentIndex;
|
||||
unsigned currentMIndex;
|
||||
float minBBox[3];
|
||||
float maxBBox[3];
|
||||
};
|
||||
|
||||
class LIB_SCENE_GRAPH_EXPORT BlenderFileLoader
|
||||
{
|
||||
public:
|
||||
@@ -51,6 +63,10 @@ public:
|
||||
|
||||
protected:
|
||||
void insertShapeNode(ObjectRen *obr, int id);
|
||||
int countClippedFaces(VertRen *v1, VertRen *v2, VertRen *v3, int clipped[3]);
|
||||
void clipLine(VertRen *v1, VertRen *v2, float c[3], float z);
|
||||
void clipTriangle(int numTris, float triCoords[][3], VertRen *v1, VertRen *v2, VertRen *v3, int clip[3]);
|
||||
void addTriangle(struct LoaderState *state, float v1[3], float v2[3], float v3[3]);
|
||||
|
||||
protected:
|
||||
Render* _re;
|
||||
|
||||
Reference in New Issue
Block a user