blender/intern/cycles/kernel/kernel_camera.h
Ton Roosendaal da376e0237 Cycles render engine, initial commit. This is the engine itself, blender modifications and build instructions will follow later.
Cycles uses code from some great open source projects, many thanks them:

* BVH building and traversal code from NVidia's "Understanding the Efficiency of Ray Traversal on GPUs":
http://code.google.com/p/understanding-the-efficiency-of-ray-traversal-on-gpus/
* Open Shading Language for a large part of the shading system:
http://code.google.com/p/openshadinglanguage/
* Blender for procedural textures and a few other nodes.
* Approximate Catmull Clark subdivision from NVidia Mesh tools:
http://code.google.com/p/nvidia-mesh-tools/
* Sobol direction vectors from:
http://web.maths.unsw.edu.au/~fkuo/sobol/
* Film response functions from:
http://www.cs.columbia.edu/CAVE/software/softlib/dorf.php
2011-04-27 11:58:34 +00:00

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/*
* Copyright 2011, Blender Foundation.
*
* 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.
*/
CCL_NAMESPACE_BEGIN
/* Perspective Camera */
__device void camera_sample_perspective(KernelGlobals *kg, float raster_x, float raster_y, float lens_u, float lens_v, Ray *ray)
{
/* create ray form raster position */
Transform rastertocamera = kernel_data.cam.rastertocamera;
float3 Pcamera = transform(&rastertocamera, make_float3(raster_x, raster_y, 0.0f));
ray->P = make_float3(0.0f, 0.0f, 0.0f);
ray->D = Pcamera;
/* modify ray for depth of field */
float lensradius = kernel_data.cam.lensradius;
if(lensradius > 0.0f) {
/* sample point on lens */
float2 lensuv;
lensuv = concentric_sample_disk(lens_u, lens_v);
lensuv *= lensradius;
/* compute point on plane of focus */
float ft = kernel_data.cam.focaldistance/ray->D.z;
float3 Pfocus = ray->P + ray->D*ft;
/* update ray for effect of lens */
ray->P = make_float3(lensuv.x, lensuv.y, 0.0f);
ray->D = normalize(Pfocus - ray->P);
}
/* transform ray from camera to world */
Transform cameratoworld = kernel_data.cam.cameratoworld;
ray->P = transform(&cameratoworld, ray->P);
ray->D = transform_direction(&cameratoworld, ray->D);
ray->D = normalize(ray->D);
#ifdef __RAY_DIFFERENTIALS__
/* ray differential */
float3 Ddiff = transform_direction(&cameratoworld, Pcamera);
ray->dP.dx = make_float3(0.0f, 0.0f, 0.0f);
ray->dP.dy = make_float3(0.0f, 0.0f, 0.0f);
ray->dD.dx = normalize(Ddiff + kernel_data.cam.dx) - normalize(Ddiff);
ray->dD.dy = normalize(Ddiff + kernel_data.cam.dy) - normalize(Ddiff);
#endif
#ifdef __CAMERA_CLIPPING__
/* clipping */
ray->P += kernel_data.cam.nearclip*ray->D;
ray->t = kernel_data.cam.cliplength;
#else
ray->t = FLT_MAX;
#endif
}
/* Orthographic Camera */
__device void camera_sample_orthographic(KernelGlobals *kg, float raster_x, float raster_y, Ray *ray)
{
/* create ray form raster position */
Transform rastertocamera = kernel_data.cam.rastertocamera;
float3 Pcamera = transform(&rastertocamera, make_float3(raster_x, raster_y, 0.0f));
ray->P = Pcamera;
ray->D = make_float3(0.0f, 0.0f, 1.0f);
/* transform ray from camera to world */
Transform cameratoworld = kernel_data.cam.cameratoworld;
ray->P = transform(&cameratoworld, ray->P);
ray->D = transform_direction(&cameratoworld, ray->D);
ray->D = normalize(ray->D);
#ifdef __RAY_DIFFERENTIALS__
/* ray differential */
ray->dP.dx = kernel_data.cam.dx;
ray->dP.dy = kernel_data.cam.dy;
ray->dD.dx = make_float3(0.0f, 0.0f, 0.0f);
ray->dD.dy = make_float3(0.0f, 0.0f, 0.0f);
#endif
#ifdef __CAMERA_CLIPPING__
/* clipping */
ray->t = kernel_data.cam.cliplength;
#else
ray->t = FLT_MAX;
#endif
}
/* Common */
__device void camera_sample(KernelGlobals *kg, int x, int y, float filter_u, float filter_v, float lens_u, float lens_v, Ray *ray)
{
/* pixel filter */
float raster_x = x + kernel_tex_interp(__filter_table, filter_u);
float raster_y = y + kernel_tex_interp(__filter_table, filter_v);
/* motion blur */
//ray->time = lerp(time_t, kernel_data.cam.shutter_open, kernel_data.cam.shutter_close);
/* sample */
if(kernel_data.cam.ortho)
camera_sample_orthographic(kg, raster_x, raster_y, ray);
else
camera_sample_perspective(kg, raster_x, raster_y, lens_u, lens_v, ray);
}
CCL_NAMESPACE_END