OpenCascade/occt
1
0
Fork 0
mirror of https://git.dev.opencascade.org/repos/occt.git synced 2025-08-14 13:30:48 +03:00
Code Activity

0028218: Visualization, Path Tracing - Redesign path tracing materials to support two-layered model

Browse Source 
Existing OCCT path tracing engine used very simple additive material (BSDF) model, so it was possible to reproduce
behavior only of very basic materials such as metal, glass, or plastic. However, some important in CAD industry
materials like car paint or ceramic could not be modeled well. In this patch, OCCT BSDF was significantly improved
by replacing additive model with two-layered scattering model. Therefore, we have base diffuse, glossy, or transmissive
layer, covered by one glossy/specular coat. The layers themselves have no thickness; they can simply reflect light or
transmits it to the layer under it. Balancing different combinations of layer properties can produce a wide range of
different effects. At the same time, disabling the first (coat) layer allows to keep full compatibility with previously
supported scattering model. All new parameters are available via 'vbsdf' command.

Location of new sample for few material examples:
samples\tcl\pathtrace_materials.tcl

Fix shader compilation issue.

Fix test case sample_ball_alpha.

Shaders_PathtraceBase_fs.pxx - regenerate resource from origin
This commit is contained in:
dbp
2016-11-18 17:53:10 +03:00
committed by bugmaster
parent dc858f4c5a
commit 05aa616d6d
15 changed files with 1045 additions and 656 deletions
Download Patch File Download Diff File Expand all files Collapse all files

20
src/Shaders/Shaders_RaytraceBase_fs.pxx
View File

@@ -356,16 +356,16 @@ static const char Shaders_RaytraceBase_fs[] =
" ivec4 SubData;\n"
"};\n"
"\n"
"#define MATERIAL_AMBN(index) (18 * index + 0)\n"
"#define MATERIAL_DIFF(index) (18 * index + 1)\n"
"#define MATERIAL_SPEC(index) (18 * index + 2)\n"
"#define MATERIAL_EMIS(index) (18 * index + 3)\n"
"#define MATERIAL_REFL(index) (18 * index + 4)\n"
"#define MATERIAL_REFR(index) (18 * index + 5)\n"
"#define MATERIAL_TRAN(index) (18 * index + 6)\n"
"#define MATERIAL_TRS1(index) (18 * index + 7)\n"
"#define MATERIAL_TRS2(index) (18 * index + 8)\n"
"#define MATERIAL_TRS3(index) (18 * index + 9)\n"
"#define MATERIAL_AMBN(index) (19 * index + 0)\n"
"#define MATERIAL_DIFF(index) (19 * index + 1)\n"
"#define MATERIAL_SPEC(index) (19 * index + 2)\n"
"#define MATERIAL_EMIS(index) (19 * index + 3)\n"
"#define MATERIAL_REFL(index) (19 * index + 4)\n"
"#define MATERIAL_REFR(index) (19 * index + 5)\n"
"#define MATERIAL_TRAN(index) (19 * index + 6)\n"
"#define MATERIAL_TRS1(index) (19 * index + 7)\n"
"#define MATERIAL_TRS2(index) (19 * index + 8)\n"
"#define MATERIAL_TRS3(index) (19 * index + 9)\n"
"\n"
"#define TRS_OFFSET(treelet) treelet.SubData.x\n"
"#define BVH_OFFSET(treelet) treelet.SubData.y\n"