ELightMapInteractionType UStaticMeshComponent::GetStaticLightingType() const
{
bool bUseTextureMap = false;
if( HasValidSettingsForStaticLighting() )
{
// Process each LOD separately.
TArray<FStaticMeshStaticLightingMesh*> StaticLightingMeshes;
for(int32 LODIndex = 0;LODIndex < StaticMesh->RenderData->LODResources.Num();LODIndex++)
{
const FStaticMeshLODResources& LODRenderData = StaticMesh->RenderData->LODResources[LODIndex];
// Figure out whether we are storing the lighting/ shadowing information in a texture or vertex buffer.
int32 LightMapWidth = 0;
int32 LightMapHeight = 0;
GetLightMapResolution( LightMapWidth, LightMapHeight );
if ((LightMapWidth > 0) && (LightMapHeight > 0) &&
(StaticMesh->LightMapCoordinateIndex >= 0) &&
((uint32)StaticMesh->LightMapCoordinateIndex < LODRenderData.VertexBuffer.GetNumTexCoords())
)
{
bUseTextureMap = true;
break;
}
}
}
return (bUseTextureMap == true) ? LMIT_Texture : LMIT_None;
}
void UStaticMeshComponent::GetStaticLightingInfo(FStaticLightingPrimitiveInfo& OutPrimitiveInfo,const TArray<ULightComponent*>& InRelevantLights,const FLightingBuildOptions& Options)
{
if( HasValidSettingsForStaticLighting() )
{
int32 BaseLightMapWidth = 0;
int32 BaseLightMapHeight = 0;
GetLightMapResolution( BaseLightMapWidth, BaseLightMapHeight );
TArray<FStaticMeshStaticLightingMesh*> StaticLightingMeshes;
bool bCanLODsShareStaticLighting = StaticMesh->CanLODsShareStaticLighting();
int32 NumLODs = bCanLODsShareStaticLighting ? 1 : StaticMesh->RenderData->LODResources.Num();
for(int32 LODIndex = 0;LODIndex < NumLODs;LODIndex++)
{
const FStaticMeshLODResources& LODRenderData = StaticMesh->RenderData->LODResources[LODIndex];
// Figure out whether we are storing the lighting/ shadowing information in a texture or vertex buffer.
bool bUseTextureMap;
if( (BaseLightMapWidth > 0) && (BaseLightMapHeight > 0)
&& StaticMesh->LightMapCoordinateIndex >= 0
&& (uint32)StaticMesh->LightMapCoordinateIndex < LODRenderData.VertexBuffer.GetNumTexCoords())
{
bUseTextureMap = true;
}
else
{
bUseTextureMap = false;
}
if(bUseTextureMap)
{
// Create a static lighting mesh for the LOD.
FStaticMeshStaticLightingMesh* StaticLightingMesh = AllocateStaticLightingMesh(LODIndex,InRelevantLights);
OutPrimitiveInfo.Meshes.Add(StaticLightingMesh);
StaticLightingMeshes.Add(StaticLightingMesh);
// Shrink LOD texture lightmaps by half for each LOD level
const int32 LightMapWidth = LODIndex > 0 ? FMath::Max(BaseLightMapWidth / (2 << (LODIndex - 1)), 32) : BaseLightMapWidth;
const int32 LightMapHeight = LODIndex > 0 ? FMath::Max(BaseLightMapHeight / (2 << (LODIndex - 1)), 32) : BaseLightMapHeight;
// Create a static lighting texture mapping for the LOD.
OutPrimitiveInfo.Mappings.Add(new FStaticMeshStaticLightingTextureMapping(
this,LODIndex,StaticLightingMesh,LightMapWidth,LightMapHeight,StaticMesh->LightMapCoordinateIndex,true));
}
}
// Give each LOD's static lighting mesh a list of the other LODs of this primitive, so they can disallow shadow casting between LODs.
for(int32 MeshIndex = 0;MeshIndex < StaticLightingMeshes.Num();MeshIndex++)
{
for(int32 OtherMeshIndex = 0;OtherMeshIndex < StaticLightingMeshes.Num();OtherMeshIndex++)
{
if(MeshIndex != OtherMeshIndex)
{
StaticLightingMeshes[MeshIndex]->OtherLODs.Add(StaticLightingMeshes[OtherMeshIndex]);
}
}
}
}
}
