diff options
Diffstat (limited to 'intern/cycles/kernel/geom/geom_motion_triangle.h')
| -rw-r--r-- | intern/cycles/kernel/geom/geom_motion_triangle.h | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/intern/cycles/kernel/geom/geom_motion_triangle.h b/intern/cycles/kernel/geom/geom_motion_triangle.h index cd28b75c22c..7ac6807e749 100644 --- a/intern/cycles/kernel/geom/geom_motion_triangle.h +++ b/intern/cycles/kernel/geom/geom_motion_triangle.h @@ -117,4 +117,39 @@ ccl_device_inline void motion_triangle_vertices(KernelGlobals *kg, int object, i verts[2] = (1.0f - t)*verts[2] + t*next_verts[2]; } +ccl_device_inline float3 motion_triangle_smooth_normal(KernelGlobals *kg, float3 Ng, int object, int prim, float u, float v, float time) +{ + /* get motion info */ + int numsteps, numverts; + object_motion_info(kg, object, &numsteps, &numverts, NULL); + + /* figure out which steps we need to fetch and their interpolation factor */ + int maxstep = numsteps*2; + int step = min((int)(time*maxstep), maxstep-1); + float t = time*maxstep - step; + + /* find attribute */ + AttributeElement elem; + int offset = find_attribute_motion(kg, object, ATTR_STD_MOTION_VERTEX_NORMAL, &elem); + kernel_assert(offset != ATTR_STD_NOT_FOUND); + + /* fetch normals */ + float3 normals[3], next_normals[3]; + uint4 tri_vindex = kernel_tex_fetch(__tri_vindex, prim); + + motion_triangle_normals_for_step(kg, tri_vindex, offset, numverts, numsteps, step, normals); + motion_triangle_normals_for_step(kg, tri_vindex, offset, numverts, numsteps, step+1, next_normals); + + /* interpolate between steps */ + normals[0] = (1.0f - t)*normals[0] + t*next_normals[0]; + normals[1] = (1.0f - t)*normals[1] + t*next_normals[1]; + normals[2] = (1.0f - t)*normals[2] + t*next_normals[2]; + + /* interpolate between vertices */ + float w = 1.0f - u - v; + float3 N = safe_normalize(u*normals[0] + v*normals[1] + w*normals[2]); + + return is_zero(N)? Ng: N; +} + CCL_NAMESPACE_END |