diff options
Diffstat (limited to 'intern/cycles/kernel/kernel_volume.h')
| -rw-r--r-- | intern/cycles/kernel/kernel_volume.h | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/intern/cycles/kernel/kernel_volume.h b/intern/cycles/kernel/kernel_volume.h index a07ce6be077..c7cb29b5af2 100644 --- a/intern/cycles/kernel/kernel_volume.h +++ b/intern/cycles/kernel/kernel_volume.h @@ -1262,4 +1262,30 @@ ccl_device void kernel_volume_stack_update_for_subsurface(KernelGlobals *kg, } #endif +/* Clean stack after the last bounce. + * + * It is expected that all volumes are closed manifolds, so at the time when ray + * hits nothing (for example, it is a last bounce which goes to environment) the + * only expected volume in the stack is the world's one. All the rest volume + * entries should have been exited already. + * + * This isn't always true because of ray intersection precision issues, which + * could lead us to an infinite non-world volume in the stack, causing render + * artifacts. + * + * Use this function after the last bounce to get rid of all volumes apart from + * the world's one after the last bounce to avoid render artifacts. + */ +ccl_device_inline void kernel_volume_clean_stack(KernelGlobals *kg, + VolumeStack *volume_stack) +{ + if(kernel_data.background.volume_shader != SHADER_NONE) { + /* Keep the world's volume in stack. */ + volume_stack[1].shader = SHADER_NONE; + } + else { + volume_stack[0].shader = SHADER_NONE; + } +} + CCL_NAMESPACE_END |