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Fix for bug #4966:

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Texture painting handled non-planar quads incorrectly in some cases.
This commit is contained in:
Brecht Van Lommel
2006-09-07 08:15:15 +00:00
parent e3d1a6ea9b
commit ec1854697b
1 changed files with 11 additions and 8 deletions
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19
source/blender/src/editface.c
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@@ -1562,7 +1562,8 @@ static int texpaint_projected_verts(Object *ob, Mesh *mesh, TFace *tf, float *v1
/* compute uv coordinates of mouse in face */
void texpaint_pick_uv(Object *ob, Mesh *mesh, TFace *tf, short *xy, float *uv)
{
float v1[2], v2[2], v3[2], v4[2], p[2], w[3];
float v1[2], v2[2], v3[2], v4[2], p[2], w[3], w2[3];
float absw, absw2;
int nvert;
/* compute barycentric coordinates of point in face and interpolate uv's.
@@ -1575,14 +1576,16 @@ void texpaint_pick_uv(Object *ob, Mesh *mesh, TFace *tf, short *xy, float *uv)
if (nvert == 4) {
texpaint_barycentric_2d(v1, v2, v4, p, w);
if(w[0] < 0.0f) {
/* if w[0] is negative, co is on the other side of the v1-v3 edge,
so we interpolate using the other triangle */
texpaint_barycentric_2d(v2, v3, v4, p, w);
texpaint_barycentric_2d(v2, v3, v4, p, w2);
uv[0]= tf->uv[1][0]*w[0] + tf->uv[2][0]*w[1] + tf->uv[3][0]*w[2];
uv[1]= tf->uv[1][1]*w[0] + tf->uv[2][1]*w[1] + tf->uv[3][1]*w[2];
/* the triangle with the largest absolute values is the one with the
most negative weights */
absw= fabs(w[0]) + fabs(w[1]) + fabs(w[2]);
absw2= fabs(w2[0]) + fabs(w2[1]) + fabs(w2[2]);
if(absw > absw2) {
uv[0]= tf->uv[1][0]*w2[0] + tf->uv[2][0]*w2[1] + tf->uv[3][0]*w2[2];
uv[1]= tf->uv[1][1]*w2[0] + tf->uv[2][1]*w2[1] + tf->uv[3][1]*w2[2];
}
else {
uv[0]= tf->uv[0][0]*w[0] + tf->uv[1][0]*w[1] + tf->uv[3][0]*w[2];