void Tracer::evaluate_alpha(
const Material& material,
const ShadingPoint& shading_point,
Alpha& alpha) const
{
// Init to fully opaque.
alpha.set(1.0f);
// Evaluate the alpha map at the shading point.
if (const Source* alpha_map = material.get_alpha_map())
{
alpha_map->evaluate(
m_texture_cache,
shading_point.get_uv(0),
alpha);
}
#ifdef WITH_OSL
if (const ShaderGroup* sg = material.get_osl_surface())
{
if (sg->has_transparency())
{
Alpha a;
m_shadergroup_exec.execute_transparency(
*sg,
shading_point,
a);
alpha *= a;
}
}
#endif
}
void process_transparency_tree(const OSL::ClosureColor* ci, Alpha& alpha)
{
// Convert from transparency to opacity.
float transp = luminance(do_process_closure_id_tree(ci, TransparentID));
alpha.set(1.0f - clamp(transp, 0.0f, 1.0f));
}
void process_transparency_tree(const OSL::ClosureColor* ci, Alpha& alpha)
{
// Convert from transparency to opacity.
const float transparency = saturate(luminance(do_process_closure_id_tree(ci, TransparentID)));
alpha.set(1.0f - transparency);
}