void AFlarePlanetarium::BeginPlay()
{
Super::BeginPlay();
FLOG("AFlarePlanetarium::BeginPlay");
TArray<UActorComponent*> Components = GetComponentsByClass(UStaticMeshComponent::StaticClass());
for (int32 ComponentIndex = 0; ComponentIndex < Components.Num(); ComponentIndex++)
{
UStaticMeshComponent* PlanetCandidate = Cast<UStaticMeshComponent>(Components[ComponentIndex]);
if (PlanetCandidate)
{
// Apply a new dynamic material to planets so that we can control shading parameters
UMaterialInstanceConstant* BasePlanetMaterial = Cast<UMaterialInstanceConstant>(PlanetCandidate->GetMaterial(0));
if (BasePlanetMaterial)
{
//FLOGV("AFlarePlanetarium::BeginPlay : found planet '%s'", *PlanetCandidate->GetName());
#if PLATFORM_LINUX
int32 UseNormalAsLightingDirection = 1;
#else
int32 UseNormalAsLightingDirection = 0;
#endif
UMaterialInstanceDynamic* PlanetMaterial = UMaterialInstanceDynamic::Create(BasePlanetMaterial, GetWorld());
PlanetCandidate->SetMaterial(0, PlanetMaterial);
PlanetMaterial->SetScalarParameterValue("UseNormalAsLightingDirection", UseNormalAsLightingDirection);
}
}
}
}
void AFlarePlanetarium::SetupCelestialBody(CelestialBodyPosition* BodyPosition, double DisplayDistance, double DisplayRadius)
{
FVector PlayerShipLocation = FVector::ZeroVector;
if (GetGame()->GetPC()->GetShipPawn())
{
PlayerShipLocation = GetGame()->GetPC()->GetShipPawn()->GetActorLocation();
}
#ifdef PLANETARIUM_DEBUG
DrawDebugSphere(GetWorld(), FVector::ZeroVector, DisplayDistance /1000 , 32, FColor::Blue, false);
PlayerShipLocation = FVector::ZeroVector;
DisplayRadius /= 1000;
DisplayDistance /= 1000;
#endif
BodyPosition->BodyComponent->SetRelativeLocation((DisplayDistance * BodyPosition->AlignedLocation.GetUnsafeNormal()).ToVector() + PlayerShipLocation);
float Scale = DisplayRadius / 512; // Mesh size is 1024;
BodyPosition->BodyComponent->SetRelativeScale3D(FPreciseVector(Scale).ToVector());
FTransform BaseRotation = FTransform(FRotator(0, 0 ,90));
FTransform TimeRotation = FTransform(FRotator(0, BodyPosition->TotalRotation, 0));
FQuat Rotation = (TimeRotation * BaseRotation).GetRotation();
// TODO Rotation float time interpolation
BodyPosition->BodyComponent->SetRelativeRotation(FQuat::Identity);
BodyPosition->BodyComponent->SetRelativeRotation(Rotation);
// Apply sun direction to component
UMaterialInstanceDynamic* ComponentMaterial = Cast<UMaterialInstanceDynamic>(BodyPosition->BodyComponent->GetMaterial(0));
if (!ComponentMaterial)
{
ComponentMaterial = UMaterialInstanceDynamic::Create(BodyPosition->BodyComponent->GetMaterial(0) , GetWorld());
BodyPosition->BodyComponent->SetMaterial(0, ComponentMaterial);
}
ComponentMaterial->SetVectorParameterValue("SunDirection", SunDirection.ToVector());
// Look for rings and orient them
TArray<USceneComponent*> RingCandidates;
BodyPosition->BodyComponent->GetChildrenComponents(true, RingCandidates);
for (int32 ComponentIndex = 0; ComponentIndex < RingCandidates.Num(); ComponentIndex++)
{
UStaticMeshComponent* RingComponent = Cast<UStaticMeshComponent>(RingCandidates[ComponentIndex]);
if (RingComponent && RingComponent->GetName().Contains("ring"))
{
// Get or create the material
UMaterialInstanceDynamic* RingMaterial = Cast<UMaterialInstanceDynamic>(RingComponent->GetMaterial(0));
if (!RingMaterial)
{
RingMaterial = UMaterialInstanceDynamic::Create(RingComponent->GetMaterial(0), GetWorld());
RingComponent->SetMaterial(0, RingMaterial);
}
// Get world-space rotation angles for the ring and the sun
float SunRotationPitch = FMath::RadiansToDegrees(FMath::Atan2(SunDirection.Z,SunDirection.X)) + 180;
float RingRotationPitch = -BodyPosition->TotalRotation;
// Feed params to the shader
RingMaterial->SetScalarParameterValue("RingPitch", RingRotationPitch / 360);
RingMaterial->SetScalarParameterValue("SunPitch", SunRotationPitch / 360);
}
}
// Sun also rotates to track direction
if (BodyPosition->Body == &Sun)
{
BodyPosition->BodyComponent->SetRelativeRotation(SunDirection.ToVector().Rotation());
}
// Compute sun occlusion
if (BodyPosition->Body != &Sun)
{
double OcclusionAngle = FPreciseMath::Asin(BodyPosition->Radius / BodyPosition->Distance);
float BodyPhase = FMath::UnwindRadians(FMath::Atan2(BodyPosition->AlignedLocation.Z, BodyPosition->AlignedLocation.X));
float CenterAngularDistance = FMath::Abs(FMath::UnwindRadians(SunPhase - BodyPhase));
float AngleSum = (SunOcclusionAngle + OcclusionAngle);
float AngleDiff = FMath::Abs(SunOcclusionAngle - OcclusionAngle);
/*FLOGV("SetupCelestialBody %s BodyPhase = %f", *BodyPosition->Body->Name.ToString(), FMath::RadiansToDegrees(BodyPhase));
FLOGV("SetupCelestialBody %s SunPhase = %f", *BodyPosition->Body->Name.ToString(), FMath::RadiansToDegrees(SunPhase));
FLOGV("SetupCelestialBody %s OcclusionAngle = %f", *BodyPosition->Body->Name.ToString(), FMath::RadiansToDegrees(OcclusionAngle));
FLOGV("SetupCelestialBody %s SunOcclusionAngle = %f", *BodyPosition->Body->Name.ToString(), FMath::RadiansToDegrees(SunOcclusionAngle));
FLOGV("SetupCelestialBody %s AngleDiff = %f", *BodyPosition->Body->Name.ToString(), FMath::RadiansToDegrees(AngleDiff));
FLOGV("SetupCelestialBody %s CenterAngularDistance = %f", *BodyPosition->Body->Name.ToString(), FMath::RadiansToDegrees(CenterAngularDistance));
FLOGV("SetupCelestialBody %s AngleSum = %f", *BodyPosition->Body->Name.ToString(), FMath::RadiansToDegrees(AngleSum));*/
if (CenterAngularDistance < AngleSum)
{
// There is occlusion
float OcclusionRatio;
if (CenterAngularDistance < AngleDiff)
{
// Maximum occlusion
OcclusionRatio = 1.0;
}
else
{
// Partial occlusion
OcclusionRatio = (AngleSum - CenterAngularDistance) / (2* FMath::Min(SunOcclusionAngle, OcclusionAngle));
// OcclusionRatio = ((SunOcclusionAngle + OcclusionAngle) + FMath::Max(SunOcclusionAngle, OcclusionAngle) - FMath::Min(SunOcclusionAngle, OcclusionAngle)) / (2 * CenterAngularDistance);
}
//FLOGV("MoveCelestialBody %s OcclusionRatio = %f", *Body->Name, OcclusionRatio);
// Now, find the surface occlusion
float SunAngularSurface = PI*FMath::Square(SunOcclusionAngle);
float MaxOcclusionAngularSurface = PI*FMath::Square(FMath::Min(SunOcclusionAngle, OcclusionAngle));
float MaxOcclusion = MaxOcclusionAngularSurface / SunAngularSurface;
float Occlusion = OcclusionRatio * MaxOcclusion;
/*FLOGV("SetupCelestialBody %s CenterAngularDistance = %f", *BodyPosition->Body->Name.ToString(), CenterAngularDistance);
FLOGV("SetupCelestialBody %s SunOcclusionAngle = %f", *BodyPosition->Body->Name.ToString(), SunOcclusionAngle);
FLOGV("SetupCelestialBody %s OcclusionAngle = %f", *BodyPosition->Body->Name.ToString(), OcclusionAngle);
FLOGV("SetupCelestialBody %s SunAngularSurface = %f", *BodyPosition->Body->Name.ToString(), SunAngularSurface);
FLOGV("SetupCelestialBody %s MaxOcclusionAngularSurface = %f", *BodyPosition->Body->Name.ToString(), MaxOcclusionAngularSurface);
FLOGV("SetupCelestialBody %s MaxOcclusion = %f", *BodyPosition->Body->Name.ToString(), MaxOcclusion);
FLOGV("SetupCelestialBody %s Occlusion = %f", *BodyPosition->Body->Name.ToString(), Occlusion);*/
if (Occlusion > SunOcclusion)
{
// Keep only best occlusion
SunOcclusion = Occlusion;
}
}
}
}
