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Add a property to control the bounce indirect energy in BakedLightmap

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Higher values will make indirect lighting brighter.
A value of 1.0 represents physically accurate behavior, but higher values
can be used to make indirect lighting propagate more visibly when using
a low number of bounces.

This can be used to speed up bake times by lowering the number of bounces
then increasing the bounce indirect energy. Unlike BakedLightmapData's
energy property, this property does not affect direct lighting
emitted by light nodes or emissive materials.
This commit is contained in:
Hugo Locurcio
2021-07-25 02:55:36 +02:00
parent d22f487dfe
commit 974d3aa9cd
7 changed files with 34 additions and 8 deletions
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5
modules/lightmapper_cpu/lightmapper_cpu.cpp
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@@ -897,7 +897,7 @@ void LightmapperCPU::_compute_indirect_light(uint32_t p_idx, void *r_lightmap) {
color += throughput * sample.emission;
throughput *= sample.albedo;
color += throughput * sample.direct_light;
color += throughput * sample.direct_light * parameters.bounce_indirect_energy;
// Russian Roulette
// https://computergraphics.stackexchange.com/questions/2316/is-russian-roulette-really-the-answer
@@ -1256,7 +1256,7 @@ void LightmapperCPU::_blit_lightmap(const Vector<Vector3> &p_src, const Vector2i
p_dst->unlock();
}
LightmapperCPU::BakeError LightmapperCPU::bake(BakeQuality p_quality, bool p_use_denoiser, int p_bounces, float p_bias, bool p_generate_atlas, int p_max_texture_size, const Ref<Image> &p_environment_panorama, const Basis &p_environment_transform, BakeStepFunc p_step_function, void *p_bake_userdata, BakeStepFunc p_substep_function) {
LightmapperCPU::BakeError LightmapperCPU::bake(BakeQuality p_quality, bool p_use_denoiser, int p_bounces, float p_bounce_indirect_energy, float p_bias, bool p_generate_atlas, int p_max_texture_size, const Ref<Image> &p_environment_panorama, const Basis &p_environment_transform, BakeStepFunc p_step_function, void *p_bake_userdata, BakeStepFunc p_substep_function) {
if (p_step_function) {
bool cancelled = p_step_function(0.0, TTR("Begin Bake"), p_bake_userdata, true);
if (cancelled) {
@@ -1272,6 +1272,7 @@ LightmapperCPU::BakeError LightmapperCPU::bake(BakeQuality p_quality, bool p_use
parameters.use_denoiser = p_use_denoiser;
parameters.bias = p_bias;
parameters.bounces = p_bounces;
parameters.bounce_indirect_energy = p_bounce_indirect_energy;
parameters.environment_transform = p_environment_transform;
parameters.environment_panorama = p_environment_panorama;