void FSceneView::UpdateViewMatrix()
{
FVector StereoViewLocation = ViewLocation;
if (GEngine->IsStereoscopic3D() && StereoPass != eSSP_FULL)
{
GEngine->StereoRenderingDevice->CalculateStereoViewOffset(StereoPass, ViewRotation, WorldToMetersScale, StereoViewLocation);
ViewLocation = StereoViewLocation;
}
ViewMatrices.ViewOrigin = StereoViewLocation;
ViewMatrices.ViewMatrix = FTranslationMatrix(-StereoViewLocation);
ViewMatrices.ViewMatrix = ViewMatrices.ViewMatrix * FInverseRotationMatrix(ViewRotation);
ViewMatrices.ViewMatrix = ViewMatrices.ViewMatrix * FMatrix(
FPlane(0, 0, 1, 0),
FPlane(1, 0, 0, 0),
FPlane(0, 1, 0, 0),
FPlane(0, 0, 0, 1));
ViewMatrices.PreViewTranslation = -ViewMatrices.ViewOrigin;
FMatrix TranslatedViewMatrix = FTranslationMatrix(-ViewMatrices.PreViewTranslation) * ViewMatrices.ViewMatrix;
// Compute a transform from view origin centered world-space to clip space.
ViewMatrices.TranslatedViewProjectionMatrix = TranslatedViewMatrix * ViewMatrices.ProjMatrix;
ViewMatrices.InvTranslatedViewProjectionMatrix = ViewMatrices.TranslatedViewProjectionMatrix.Inverse();
ViewProjectionMatrix = ViewMatrices.GetViewProjMatrix();
InvViewMatrix = ViewMatrices.GetInvViewMatrix();
InvViewProjectionMatrix = ViewMatrices.GetInvViewProjMatrix();
}
FMatrix FJavascriptUMGViewportCameraTransform::ComputeOrbitMatrix() const
{
FTransform Transform =
FTransform(-LookAt) *
FTransform(FRotator(0, ViewRotation.Yaw, 0)) *
FTransform(FRotator(0, 0, ViewRotation.Pitch)) *
FTransform(FVector(0, (ViewLocation - LookAt).Size(), 0));
return Transform.ToMatrixNoScale() * FInverseRotationMatrix(FRotator(0, 90.f, 0));
}
FSceneView* FJavascriptUMGViewportClient::CalcSceneView(FSceneViewFamily* ViewFamily)
{
FSceneViewInitOptions ViewInitOptions;
const FVector& ViewLocation = GetViewLocation();
const FRotator& ViewRotation = GetViewRotation();
const FIntPoint ViewportSizeXY = Viewport->GetSizeXY();
FIntRect ViewRect = FIntRect(0, 0, ViewportSizeXY.X, ViewportSizeXY.Y);
ViewInitOptions.SetViewRectangle(ViewRect);
ViewInitOptions.ViewOrigin = ViewLocation;
ViewInitOptions.ViewRotationMatrix = FInverseRotationMatrix(ViewRotation);
ViewInitOptions.ViewRotationMatrix = ViewInitOptions.ViewRotationMatrix * FMatrix(
FPlane(0, 0, 1, 0),
FPlane(1, 0, 0, 0),
FPlane(0, 1, 0, 0),
FPlane(0, 0, 0, 1));
//@TODO: Should probably be locally configurable (or just made into a FMinimalViewInfo property)
const EAspectRatioAxisConstraint AspectRatioAxisConstraint = GetDefault<ULocalPlayer>()->AspectRatioAxisConstraint;
FMinimalViewInfo::CalculateProjectionMatrixGivenView(ViewInfo, AspectRatioAxisConstraint, Viewport, /*inout*/ ViewInitOptions);
ViewInitOptions.ViewFamily = ViewFamily;
ViewInitOptions.SceneViewStateInterface = ViewState.GetReference();
ViewInitOptions.ViewElementDrawer = this;
ViewInitOptions.BackgroundColor = GetBackgroundColor();
//ViewInitOptions.EditorViewBitflag = 0, // send the bit for this view - each actor will check it's visibility bits against this
// for ortho views to steal perspective view origin
//ViewInitOptions.OverrideLODViewOrigin = FVector::ZeroVector;
//ViewInitOptions.bUseFauxOrthoViewPos = true;
//ViewInitOptions.CursorPos = CurrentMousePos;
FSceneView* View = new FSceneView(ViewInitOptions);
ViewFamily->Views.Add(View);
View->StartFinalPostprocessSettings(ViewLocation);
//OverridePostProcessSettings(*View);
View->EndFinalPostprocessSettings(ViewInitOptions);
return View;
}
void UWorldThumbnailRenderer::GetView(UWorld* World, FSceneViewFamily* ViewFamily, int32 X, int32 Y, uint32 SizeX, uint32 SizeY) const
{
check(ViewFamily);
check(World);
check(World->PersistentLevel);
FIntRect ViewRect(
FMath::Max<int32>(X, 0),
FMath::Max<int32>(Y, 0),
FMath::Max<int32>(X + SizeX, 0),
FMath::Max<int32>(Y + SizeY, 0));
if (ViewRect.Width() > 0 && ViewRect.Height() > 0)
{
FBox WorldBox(0);
TArray<ULevel*> LevelsToRender = World->GetLevels();
for ( auto* Level : LevelsToRender )
{
if (Level && Level->bIsVisible)
{
ALevelBounds* LevelBounds = Level->LevelBoundsActor.Get();
if (!LevelBounds)
{
// Ensure a Level Bounds Actor exists for future renders
FActorSpawnParameters SpawnParameters;
SpawnParameters.OverrideLevel = Level;
LevelBounds = World->SpawnActor<ALevelBounds>(SpawnParameters);
LevelBounds->UpdateLevelBoundsImmediately();
Level->LevelBoundsActor = LevelBounds;
}
if (!LevelBounds->IsUsingDefaultBounds())
{
WorldBox += LevelBounds->GetComponentsBoundingBox();
}
}
}
UWorldThumbnailInfo* ThumbnailInfo = Cast<UWorldThumbnailInfo>(World->ThumbnailInfo);
if (!ThumbnailInfo)
{
ThumbnailInfo = UWorldThumbnailInfo::StaticClass()->GetDefaultObject<UWorldThumbnailInfo>();
}
const FVector Origin = WorldBox.GetCenter();
FMatrix ViewMatrix = FTranslationMatrix(-Origin);
FMatrix ProjectionMatrix;
float FOVScreenSize = 0; // Screen size taking FOV into account
if (ThumbnailInfo->CameraMode == ECameraProjectionMode::Perspective)
{
const float FOVDegrees = 30.f;
const float HalfFOVRadians = FMath::DegreesToRadians<float>(FOVDegrees) * 0.5f;
const float WorldRadius = WorldBox.GetSize().Size() / 2.f;
float TargetDistance = WorldRadius / FMath::Tan(HalfFOVRadians);
if (ensure(ThumbnailInfo))
{
if (TargetDistance + ThumbnailInfo->OrbitZoom < 0)
{
ThumbnailInfo->OrbitZoom = -TargetDistance;
}
}
float OrbitPitch = GlobalOrbitPitchOffset + ThumbnailInfo->OrbitPitch;
float OrbitYaw = GlobalOrbitYawOffset + ThumbnailInfo->OrbitYaw;
float OrbitZoom = TargetDistance + ThumbnailInfo->OrbitZoom;
// Ensure a minimum camera distance to prevent problems with really small objects
const float MinCameraDistance = 48;
OrbitZoom = FMath::Max<float>(MinCameraDistance, OrbitZoom);
const FRotator RotationOffsetToViewCenter(0.f, 90.f, 0.f);
ViewMatrix = ViewMatrix *
FRotationMatrix(FRotator(0, OrbitYaw, 0)) *
FRotationMatrix(FRotator(0, 0, OrbitPitch)) *
FTranslationMatrix(FVector(0, OrbitZoom, 0)) *
FInverseRotationMatrix(RotationOffsetToViewCenter);
ViewMatrix = ViewMatrix * FMatrix(
FPlane(0, 0, 1, 0),
FPlane(1, 0, 0, 0),
FPlane(0, 1, 0, 0),
FPlane(0, 0, 0, 1));
const float NearPlane = 1.0f;
ProjectionMatrix = FReversedZPerspectiveMatrix(
HalfFOVRadians,
1.0f,
1.0f,
NearPlane
);
FOVScreenSize = SizeX / FMath::Tan(FOVDegrees);
}
else if (ThumbnailInfo->CameraMode == ECameraProjectionMode::Orthographic)
{
FVector2D WorldSizeMin2D;
FVector2D WorldSizeMax2D;
switch (ThumbnailInfo->OrthoDirection)
{
case EOrthoThumbnailDirection::Top:
ViewMatrix = ViewMatrix * FMatrix(
FPlane(1, 0, 0, 0),
FPlane(0, -1, 0, 0),
FPlane(0, 0, -1, 0),
FPlane(0, 0, Origin.Z, 1));
WorldSizeMin2D = FVector2D(WorldBox.Min.X,WorldBox.Min.Y);
WorldSizeMax2D = FVector2D(WorldBox.Max.X,WorldBox.Max.Y);
break;
case EOrthoThumbnailDirection::Bottom:
ViewMatrix = ViewMatrix * FMatrix(
FPlane(1, 0, 0, 0),
FPlane(0, -1, 0, 0),
FPlane(0, 0, 1, 0),
FPlane(0, 0, Origin.Z, 1));
WorldSizeMin2D = FVector2D(WorldBox.Min.X, WorldBox.Min.Y);
WorldSizeMax2D = FVector2D(WorldBox.Max.X, WorldBox.Max.Y);
break;
case EOrthoThumbnailDirection::Front:
ViewMatrix = ViewMatrix * FMatrix(
FPlane(1, 0, 0, 0),
FPlane(0, 0, -1, 0),
FPlane(0, 1, 0, 0),
FPlane(0, 0, Origin.Y, 1));
WorldSizeMin2D = FVector2D(WorldBox.Min.X, WorldBox.Min.Z);
WorldSizeMax2D = FVector2D(WorldBox.Max.X, WorldBox.Max.Z);
break;
case EOrthoThumbnailDirection::Back:
ViewMatrix = ViewMatrix * FMatrix(
FPlane(-1, 0, 0, 0),
FPlane(0, 0, 1, 0),
FPlane(0, 1, 0, 0),
FPlane(0, 0, Origin.Y, 1));
WorldSizeMin2D = FVector2D(WorldBox.Min.X, WorldBox.Min.Z);
WorldSizeMax2D = FVector2D(WorldBox.Max.X, WorldBox.Max.Z);
break;
case EOrthoThumbnailDirection::Left:
ViewMatrix = ViewMatrix * FMatrix(
FPlane(0, 0, -1, 0),
FPlane(-1, 0, 0, 0),
FPlane(0, 1, 0, 0),
FPlane(0, 0, Origin.X, 1));
WorldSizeMin2D = FVector2D(WorldBox.Min.Y, WorldBox.Min.Z);
WorldSizeMax2D = FVector2D(WorldBox.Max.Y, WorldBox.Max.Z);
break;
case EOrthoThumbnailDirection::Right:
ViewMatrix = ViewMatrix * FMatrix(
FPlane(0, 0, 1, 0),
FPlane(1, 0, 0, 0),
FPlane(0, 1, 0, 0),
FPlane(0, 0, Origin.X, 1));
WorldSizeMin2D = FVector2D(WorldBox.Min.Y, WorldBox.Min.Z);
WorldSizeMax2D = FVector2D(WorldBox.Max.Y, WorldBox.Max.Z);
break;
default:
// Unknown OrthoDirection
ensureMsgf(false, TEXT("Unknown thumbnail OrthoDirection"));
break;
}
FVector2D WorldSize2D = (WorldSizeMax2D - WorldSizeMin2D);
WorldSize2D.X = FMath::Abs(WorldSize2D.X);
WorldSize2D.Y = FMath::Abs(WorldSize2D.Y);
const bool bUseXAxis = (WorldSize2D.X / WorldSize2D.Y) > 1.f;
const float WorldAxisSize = bUseXAxis ? WorldSize2D.X : WorldSize2D.Y;
const uint32 ViewportAxisSize = bUseXAxis ? SizeX : SizeY;
const float OrthoZoom = WorldAxisSize / ViewportAxisSize / 2.f;
const float OrthoWidth = FMath::Max(1.f, SizeX * OrthoZoom);
const float OrthoHeight = FMath::Max(1.f, SizeY * OrthoZoom);
const float ZOffset = HALF_WORLD_MAX;
ProjectionMatrix = FReversedZOrthoMatrix(
OrthoWidth,
OrthoHeight,
0.5f / ZOffset,
ZOffset
);
FOVScreenSize = SizeX;
}
else
{
// Unknown CameraMode
ensureMsgf(false, TEXT("Unknown thumbnail CameraMode"));
}
FSceneViewInitOptions ViewInitOptions;
ViewInitOptions.ViewFamily = ViewFamily;
ViewInitOptions.SetViewRectangle(ViewRect);
ViewInitOptions.BackgroundColor = FLinearColor::Black;
ViewInitOptions.ViewMatrix = ViewMatrix;
ViewInitOptions.ProjectionMatrix = ProjectionMatrix;
FSceneView* NewView = new FSceneView(ViewInitOptions);
ViewFamily->Views.Add(NewView);
// Tell the texture streaming system about this thumbnail view, so the textures will stream in as needed
// NOTE: Sizes may not actually be in screen space depending on how the thumbnail ends up stretched by the UI. Not a big deal though.
// NOTE: Textures still take a little time to stream if the view has not been re-rendered recently, so they may briefly appear blurry while mips are prepared
// NOTE: Content Browser only renders thumbnails for loaded assets, and only when the mouse is over the panel. They'll be frozen in their last state while the mouse cursor is not over the panel. This is for performance reasons
IStreamingManager::Get().AddViewInformation(Origin, SizeX, FOVScreenSize);
}
}
void FThumbnailPreviewScene::GetView(FSceneViewFamily* ViewFamily, int32 X, int32 Y, uint32 SizeX, uint32 SizeY) const
{
check(ViewFamily);
FIntRect ViewRect(
FMath::Max<int32>(X,0),
FMath::Max<int32>(Y,0),
FMath::Max<int32>(X+SizeX,0),
FMath::Max<int32>(Y+SizeY,0));
if (ViewRect.Width() > 0 && ViewRect.Height() > 0)
{
const float FOVDegrees = 30.f;
const float HalfFOVRadians = FMath::DegreesToRadians<float>(FOVDegrees) * 0.5f;
static_assert((int32)ERHIZBuffer::IsInverted != 0, "Check NearPlane and Projection Matrix");
const float NearPlane = 1.0f;
FMatrix ProjectionMatrix = FReversedZPerspectiveMatrix(
HalfFOVRadians,
1.0f,
1.0f,
NearPlane
);
FVector Origin(0);
float OrbitPitch = 0;
float OrbitYaw = 0;
float OrbitZoom = 0;
GetViewMatrixParameters(FOVDegrees, Origin, OrbitPitch, OrbitYaw, OrbitZoom);
// Ensure a minimum camera distance to prevent problems with really small objects
const float MinCameraDistance = 48;
OrbitZoom = FMath::Max<float>(MinCameraDistance, OrbitZoom);
const FRotator RotationOffsetToViewCenter(0.f, 90.f, 0.f);
FMatrix ViewRotationMatrix = FRotationMatrix( FRotator(0, OrbitYaw, 0) ) *
FRotationMatrix( FRotator(0, 0, OrbitPitch) ) *
FTranslationMatrix( FVector(0, OrbitZoom, 0) ) *
FInverseRotationMatrix( RotationOffsetToViewCenter );
ViewRotationMatrix = ViewRotationMatrix * FMatrix(
FPlane(0, 0, 1, 0),
FPlane(1, 0, 0, 0),
FPlane(0, 1, 0, 0),
FPlane(0, 0, 0, 1));
Origin -= ViewRotationMatrix.InverseTransformPosition( FVector::ZeroVector );
ViewRotationMatrix = ViewRotationMatrix.RemoveTranslation();
FSceneViewInitOptions ViewInitOptions;
ViewInitOptions.ViewFamily = ViewFamily;
ViewInitOptions.SetViewRectangle(ViewRect);
ViewInitOptions.ViewOrigin = -Origin;
ViewInitOptions.ViewRotationMatrix = ViewRotationMatrix;
ViewInitOptions.ProjectionMatrix = ProjectionMatrix;
ViewInitOptions.BackgroundColor = FLinearColor::Black;
FSceneView* NewView = new FSceneView(ViewInitOptions);
ViewFamily->Views.Add(NewView);
NewView->StartFinalPostprocessSettings( ViewInitOptions.ViewOrigin );
NewView->EndFinalPostprocessSettings(ViewInitOptions);
FFinalPostProcessSettings::FCubemapEntry& CubemapEntry = *new(NewView->FinalPostProcessSettings.ContributingCubemaps) FFinalPostProcessSettings::FCubemapEntry;
CubemapEntry.AmbientCubemap = GUnrealEd->GetThumbnailManager()->AmbientCubemap;
const float AmbientCubemapIntensity = 1.69;
CubemapEntry.AmbientCubemapTintMulScaleValue = FLinearColor::White * AmbientCubemapIntensity;
// Tell the texture streaming system about this thumbnail view, so the textures will stream in as needed
// NOTE: Sizes may not actually be in screen space depending on how the thumbnail ends up stretched by the UI. Not a big deal though.
// NOTE: Textures still take a little time to stream if the view has not been re-rendered recently, so they may briefly appear blurry while mips are prepared
// NOTE: Content Browser only renders thumbnails for loaded assets, and only when the mouse is over the panel. They'll be frozen in their last state while the mouse cursor is not over the panel. This is for performance reasons
IStreamingManager::Get().AddViewInformation( Origin, SizeX, SizeX / FMath::Tan( FOVDegrees ) );
}
}
