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e5f40a1aacfbdad8f802d6e80ea16c687d765daf
blender-archive/source/blender/blenkernel/intern/camera.c
Campbell Barton e5f40a1aac - pyapi mathutils.geometry.intersect_plane_plane 
- isect_plane_plane_v3 uses better method
- minor refactor - arg name changes & some args as const.
2011-11-20 05:56:21 +00:00

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/*
* ***** BEGIN GPL LICENSE BLOCK *****
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
* All rights reserved.
*
* The Original Code is: all of this file.
*
* Contributor(s): none yet.
*
* ***** END GPL LICENSE BLOCK *****
*/
/** \file blender/blenkernel/intern/camera.c
* \ingroup bke
*/
#include <stdlib.h>
#include "DNA_camera_types.h"
#include "DNA_lamp_types.h"
#include "DNA_object_types.h"
#include "DNA_scene_types.h"
#include "DNA_view3d_types.h"
#include "BLI_math.h"
#include "BLI_utildefines.h"
#include "BKE_animsys.h"
#include "BKE_camera.h"
#include "BKE_object.h"
#include "BKE_global.h"
#include "BKE_library.h"
#include "BKE_main.h"
#include "BKE_screen.h"
/****************************** Camera Datablock *****************************/
void *add_camera(const char *name)
{
Camera *cam;
cam= alloc_libblock(&G.main->camera, ID_CA, name);
cam->lens= 35.0f;
cam->sensor_x= 32.0f;
cam->sensor_y= 18.0f;
cam->clipsta= 0.1f;
cam->clipend= 100.0f;
cam->drawsize= 0.5f;
cam->ortho_scale= 6.0;
cam->flag |= CAM_SHOWPASSEPARTOUT;
cam->passepartalpha = 0.5f;
return cam;
}
Camera *copy_camera(Camera *cam)
{
Camera *camn;
camn= copy_libblock(&cam->id);
id_lib_extern((ID *)camn->dof_ob);
return camn;
}
void make_local_camera(Camera *cam)
{
Main *bmain= G.main;
Object *ob;
int is_local= FALSE, is_lib= FALSE;
/* - only lib users: do nothing
* - only local users: set flag
* - mixed: make copy
*/
if(cam->id.lib==NULL) return;
if(cam->id.us==1) {
id_clear_lib_data(bmain, &cam->id);
return;
}
for(ob= bmain->object.first; ob && ELEM(0, is_lib, is_local); ob= ob->id.next) {
if(ob->data==cam) {
if(ob->id.lib) is_lib= TRUE;
else is_local= TRUE;
}
}
if(is_local && is_lib == FALSE) {
id_clear_lib_data(bmain, &cam->id);
}
else if(is_local && is_lib) {
Camera *camn= copy_camera(cam);
camn->id.us= 0;
/* Remap paths of new ID using old library as base. */
BKE_id_lib_local_paths(bmain, &camn->id);
for(ob= bmain->object.first; ob; ob= ob->id.next) {
if(ob->data == cam) {
if(ob->id.lib==NULL) {
ob->data= camn;
camn->id.us++;
cam->id.us--;
}
}
}
}
}
void free_camera(Camera *ca)
{
BKE_free_animdata((ID *)ca);
}
/******************************** Camera Usage *******************************/
void object_camera_mode(RenderData *rd, Object *cam_ob)
{
rd->mode &= ~(R_ORTHO|R_PANORAMA);
if(cam_ob && cam_ob->type==OB_CAMERA) {
Camera *cam= cam_ob->data;
if(cam->type == CAM_ORTHO) rd->mode |= R_ORTHO;
if(cam->flag & CAM_PANORAMA) rd->mode |= R_PANORAMA;
}
}
/* get the camera's dof value, takes the dof object into account */
float object_camera_dof_distance(Object *ob)
{
Camera *cam = (Camera *)ob->data;
if (ob->type != OB_CAMERA)
return 0.0f;
if (cam->dof_ob) {
/* too simple, better to return the distance on the view axis only
* return len_v3v3(ob->obmat[3], cam->dof_ob->obmat[3]); */
float mat[4][4], imat[4][4], obmat[4][4];
copy_m4_m4(obmat, ob->obmat);
normalize_m4(obmat);
invert_m4_m4(imat, obmat);
mul_m4_m4m4(mat, cam->dof_ob->obmat, imat);
return fabsf(mat[3][2]);
}
return cam->YF_dofdist;
}
float camera_sensor_size(int sensor_fit, float sensor_x, float sensor_y)
{
/* sensor size used to fit to. for auto, sensor_x is both x and y. */
if(sensor_fit == CAMERA_SENSOR_FIT_VERT)
return sensor_y;
return sensor_x;
}
int camera_sensor_fit(int sensor_fit, float sizex, float sizey)
{
if(sensor_fit == CAMERA_SENSOR_FIT_AUTO) {
if(sizex >= sizey)
return CAMERA_SENSOR_FIT_HOR;
else
return CAMERA_SENSOR_FIT_VERT;
}
return sensor_fit;
}
/******************************** Camera Params *******************************/
void camera_params_init(CameraParams *params)
{
memset(params, 0, sizeof(CameraParams));
/* defaults */
params->sensor_x= DEFAULT_SENSOR_WIDTH;
params->sensor_y= DEFAULT_SENSOR_HEIGHT;
params->sensor_fit= CAMERA_SENSOR_FIT_AUTO;
params->zoom= 1.0f;
}
void camera_params_from_object(CameraParams *params, Object *ob)
{
if(!ob)
return;
if(ob->type==OB_CAMERA) {
/* camera object */
Camera *cam= ob->data;
if(cam->type == CAM_ORTHO)
params->is_ortho= TRUE;
params->lens= cam->lens;
params->ortho_scale= cam->ortho_scale;
params->shiftx= cam->shiftx;
params->shifty= cam->shifty;
params->sensor_x= cam->sensor_x;
params->sensor_y= cam->sensor_y;
params->sensor_fit= cam->sensor_fit;
params->clipsta= cam->clipsta;
params->clipend= cam->clipend;
}
else if(ob->type==OB_LAMP) {
/* lamp object */
Lamp *la= ob->data;
float fac= cosf((float)M_PI*la->spotsize/360.0f);
float phi= acos(fac);
params->lens= 16.0f*fac/sinf(phi);
if(params->lens==0.0f)
params->lens= 35.0f;
params->clipsta= la->clipsta;
params->clipend= la->clipend;
}
}
void camera_params_from_view3d(CameraParams *params, View3D *v3d, RegionView3D *rv3d)
{
/* common */
params->lens= v3d->lens;
params->clipsta= v3d->near;
params->clipend= v3d->far;
if(rv3d->persp==RV3D_CAMOB) {
/* camera view */
camera_params_from_object(params, v3d->camera);
params->zoom= BKE_screen_view3d_zoom_to_fac((float)rv3d->camzoom);
params->offsetx= 2.0f*rv3d->camdx*params->zoom;
params->offsety= 2.0f*rv3d->camdy*params->zoom;
params->shiftx *= params->zoom;
params->shifty *= params->zoom;
params->zoom= 1.0f/params->zoom;
}
else if(rv3d->persp==RV3D_ORTHO) {
/* orthographic view */
params->clipend *= 0.5f; // otherwise too extreme low zbuffer quality
params->clipsta= - params->clipend;
params->is_ortho= TRUE;
params->ortho_scale = rv3d->dist;
params->zoom= 2.0f;
}
else {
/* perspective view */
params->zoom= 2.0f;
}
}
void camera_params_compute_viewplane(CameraParams *params, int winx, int winy, float xasp, float yasp)
{
rctf viewplane;
float pixsize, viewfac, sensor_size, dx, dy;
int sensor_fit;
/* fields rendering */
params->ycor= yasp/xasp;
if(params->use_fields)
params->ycor *= 2.0f;
if(params->is_ortho) {
/* orthographic camera */
/* scale == 1.0 means exact 1 to 1 mapping */
pixsize= params->ortho_scale;
}
else {
/* perspective camera */
sensor_size= camera_sensor_size(params->sensor_fit, params->sensor_x, params->sensor_y);
pixsize= (sensor_size * params->clipsta)/params->lens;
}
/* determine sensor fit */
sensor_fit = camera_sensor_fit(params->sensor_fit, xasp*winx, yasp*winy);
if(sensor_fit==CAMERA_SENSOR_FIT_HOR)
viewfac= winx;
else
viewfac= params->ycor * winy;
pixsize /= viewfac;
/* extra zoom factor */
pixsize *= params->zoom;
/* compute view plane:
* fully centered, zbuffer fills in jittered between -.5 and +.5 */
viewplane.xmin= -0.5f*(float)winx;
viewplane.ymin= -0.5f*params->ycor*(float)winy;
viewplane.xmax= 0.5f*(float)winx;
viewplane.ymax= 0.5f*params->ycor*(float)winy;
/* lens shift and offset */
dx= params->shiftx*viewfac + winx*params->offsetx;
dy= params->shifty*viewfac + winy*params->offsety;
viewplane.xmin += dx;
viewplane.ymin += dy;
viewplane.xmax += dx;
viewplane.ymax += dy;
/* fields offset */
if(params->field_second) {
if(params->field_odd) {
viewplane.ymin-= 0.5f * params->ycor;
viewplane.ymax-= 0.5f * params->ycor;
}
else {
viewplane.ymin+= 0.5f * params->ycor;
viewplane.ymax+= 0.5f * params->ycor;
}
}
/* the window matrix is used for clipping, and not changed during OSA steps */
/* using an offset of +0.5 here would give clip errors on edges */
viewplane.xmin *= pixsize;
viewplane.xmax *= pixsize;
viewplane.ymin *= pixsize;
viewplane.ymax *= pixsize;
params->viewdx= pixsize;
params->viewdy= params->ycor * pixsize;
params->viewplane= viewplane;
}
/* viewplane is assumed to be already computed */
void camera_params_compute_matrix(CameraParams *params)
{
rctf viewplane= params->viewplane;
/* compute projection matrix */
if(params->is_ortho)
orthographic_m4(params->winmat, viewplane.xmin, viewplane.xmax,
viewplane.ymin, viewplane.ymax, params->clipsta, params->clipend);
else
perspective_m4(params->winmat, viewplane.xmin, viewplane.xmax,
viewplane.ymin, viewplane.ymax, params->clipsta, params->clipend);
}
/***************************** Camera View Frame *****************************/
void camera_view_frame_ex(Scene *scene, Camera *camera, float drawsize, const short do_clip, const float scale[3],
float r_asp[2], float r_shift[2], float *r_drawsize, float r_vec[4][3])
{
float facx, facy;
float depth;
/* aspect correcton */
if (scene) {
float aspx= (float) scene->r.xsch*scene->r.xasp;
float aspy= (float) scene->r.ysch*scene->r.yasp;
int sensor_fit= camera_sensor_fit(camera->sensor_fit, aspx, aspy);
if(sensor_fit==CAMERA_SENSOR_FIT_HOR) {
r_asp[0]= 1.0;
r_asp[1]= aspy / aspx;
}
else {
r_asp[0]= aspx / aspy;
r_asp[1]= 1.0;
}
}
else {
r_asp[0]= 1.0f;
r_asp[1]= 1.0f;
}
if(camera->type==CAM_ORTHO) {
facx= 0.5f * camera->ortho_scale * r_asp[0] * scale[0];
facy= 0.5f * camera->ortho_scale * r_asp[1] * scale[1];
r_shift[0]= camera->shiftx * camera->ortho_scale * scale[0];
r_shift[1]= camera->shifty * camera->ortho_scale * scale[1];
depth= do_clip ? -((camera->clipsta * scale[2]) + 0.1f) : - drawsize * camera->ortho_scale * scale[2];
*r_drawsize= 0.5f * camera->ortho_scale;
}
else {
/* that way it's always visible - clipsta+0.1 */
float fac;
float half_sensor= 0.5f*((camera->sensor_fit==CAMERA_SENSOR_FIT_VERT) ? (camera->sensor_y) : (camera->sensor_x));
*r_drawsize= drawsize / ((scale[0] + scale[1] + scale[2]) / 3.0f);
if(do_clip) {
/* fixed depth, variable size (avoids exceeding clipping range) */
depth = -(camera->clipsta + 0.1f);
fac = depth / (camera->lens/(-half_sensor) * scale[2]);
}
else {
/* fixed size, variable depth (stays a reasonable size in the 3D view) */
depth= *r_drawsize * camera->lens/(-half_sensor) * scale[2];
fac= *r_drawsize;
}
facx= fac * r_asp[0] * scale[0];
facy= fac * r_asp[1] * scale[1];
r_shift[0]= camera->shiftx*fac*2 * scale[0];
r_shift[1]= camera->shifty*fac*2 * scale[1];
}
r_vec[0][0]= r_shift[0] + facx; r_vec[0][1]= r_shift[1] + facy; r_vec[0][2]= depth;
r_vec[1][0]= r_shift[0] + facx; r_vec[1][1]= r_shift[1] - facy; r_vec[1][2]= depth;
r_vec[2][0]= r_shift[0] - facx; r_vec[2][1]= r_shift[1] - facy; r_vec[2][2]= depth;
r_vec[3][0]= r_shift[0] - facx; r_vec[3][1]= r_shift[1] + facy; r_vec[3][2]= depth;
}
void camera_view_frame(Scene *scene, Camera *camera, float r_vec[4][3])
{
float dummy_asp[2];
float dummy_shift[2];
float dummy_drawsize;
const float dummy_scale[3]= {1.0f, 1.0f, 1.0f};
camera_view_frame_ex(scene, camera, FALSE, 1.0, dummy_scale,
dummy_asp, dummy_shift, &dummy_drawsize, r_vec);
}
typedef struct CameraViewFrameData {
float frame_tx[4][3];
float normal_tx[4][3];
float dist_vals[4];
unsigned int tot;
} CameraViewFrameData;
static void camera_to_frame_view_cb(const float co[3], void *user_data)
{
CameraViewFrameData *data= (CameraViewFrameData *)user_data;
unsigned int i;
for (i= 0; i < 4; i++) {
float nd= dist_to_plane_v3(co, data->frame_tx[i], data->normal_tx[i]);
if (nd < data->dist_vals[i]) {
data->dist_vals[i]= nd;
}
}
data->tot++;
}
/* dont move the camera, just yield the fit location */
/* only valid for perspective cameras */
int camera_view_frame_fit_to_scene(Scene *scene, struct View3D *v3d, Object *camera_ob, float r_co[3])
{
float shift[2];
float plane_tx[4][3];
float rot_obmat[3][3];
const float zero[3]= {0,0,0};
CameraViewFrameData data_cb;
unsigned int i;
camera_view_frame(scene, camera_ob->data, data_cb.frame_tx);
copy_m3_m4(rot_obmat, camera_ob->obmat);
normalize_m3(rot_obmat);
for (i= 0; i < 4; i++) {
/* normalize so Z is always 1.0f*/
mul_v3_fl(data_cb.frame_tx[i], 1.0f/data_cb.frame_tx[i][2]);
}
/* get the shift back out of the frame */
shift[0]= (data_cb.frame_tx[0][0] +
data_cb.frame_tx[1][0] +
data_cb.frame_tx[2][0] +
data_cb.frame_tx[3][0]) / 4.0f;
shift[1]= (data_cb.frame_tx[0][1] +
data_cb.frame_tx[1][1] +
data_cb.frame_tx[2][1] +
data_cb.frame_tx[3][1]) / 4.0f;
for (i= 0; i < 4; i++) {
mul_m3_v3(rot_obmat, data_cb.frame_tx[i]);
}
for (i= 0; i < 4; i++) {
normal_tri_v3(data_cb.normal_tx[i],
zero, data_cb.frame_tx[i], data_cb.frame_tx[(i + 1) % 4]);
}
/* initialize callback data */
data_cb.dist_vals[0]=
data_cb.dist_vals[1]=
data_cb.dist_vals[2]=
data_cb.dist_vals[3]= FLT_MAX;
data_cb.tot= 0;
/* run callback on all visible points */
BKE_scene_foreach_display_point(scene, v3d, BA_SELECT,
camera_to_frame_view_cb, &data_cb);
if (data_cb.tot <= 1) {
return FALSE;
}
else {
float plane_isect_1[3], plane_isect_1_no[3], plane_isect_1_other[3];
float plane_isect_2[3], plane_isect_2_no[3], plane_isect_2_other[3];
float plane_isect_pt_1[3], plane_isect_pt_2[3];
/* apply the dist-from-plane's to the transformed plane points */
for (i= 0; i < 4; i++) {
mul_v3_v3fl(plane_tx[i], data_cb.normal_tx[i], data_cb.dist_vals[i]);
}
isect_plane_plane_v3(plane_isect_1, plane_isect_1_no,
plane_tx[0], data_cb.normal_tx[0],
plane_tx[2], data_cb.normal_tx[2]);
isect_plane_plane_v3(plane_isect_2, plane_isect_2_no,
plane_tx[1], data_cb.normal_tx[1],
plane_tx[3], data_cb.normal_tx[3]);
add_v3_v3v3(plane_isect_1_other, plane_isect_1, plane_isect_1_no);
add_v3_v3v3(plane_isect_2_other, plane_isect_2, plane_isect_2_no);
if (isect_line_line_v3(plane_isect_1, plane_isect_1_other,
plane_isect_2, plane_isect_2_other,
plane_isect_pt_1, plane_isect_pt_2) == 0)
{
return FALSE;
}
else {
float cam_plane_no[3]= {0.0f, 0.0f, -1.0f};
float plane_isect_delta[3];
float plane_isect_delta_len;
mul_m3_v3(rot_obmat, cam_plane_no);
sub_v3_v3v3(plane_isect_delta, plane_isect_pt_2, plane_isect_pt_1);
plane_isect_delta_len= len_v3(plane_isect_delta);
if (dot_v3v3(plane_isect_delta, cam_plane_no) > 0.0f) {
copy_v3_v3(r_co, plane_isect_pt_1);
/* offset shift */
normalize_v3(plane_isect_1_no);
madd_v3_v3fl(r_co, plane_isect_1_no, shift[1] * -plane_isect_delta_len);
}
else {
copy_v3_v3(r_co, plane_isect_pt_2);
/* offset shift */
normalize_v3(plane_isect_2_no);
madd_v3_v3fl(r_co, plane_isect_2_no, shift[0] * -plane_isect_delta_len);
}
return TRUE;
}
}
}
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