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How to enable depth test for Canvas Draw?

How to enable depth test for Canvas Draw?

 FCanvas* NativeCanvas = Canvas->Canvas;

 APlayerController* PC = GetOwningPlayerController();
 ULocalPlayer* const LP = PC->GetLocalPlayer();
 if (LP && LP->ViewportClient)
     // get the projection data
     FSceneViewProjectionData ProjectionData;
     FIntPoint ViewportSize = LP->ViewportClient->Viewport->GetSizeXY();
     if (LP->GetProjectionData(LP->ViewportClient->Viewport, eSSP_FULL, /*out*/ ProjectionData))
         FMatrix const InViewProjectionMatrix = ProjectionData.ComputeViewProjectionMatrix();
         FMatrix OldBaseTransform = NativeCanvas->GetBottomTransform();


         FHitProxyId HitProxyId = NativeCanvas->GetHitProxyId();
         FBatchedElements* LineBatcher = NativeCanvas->GetBatchedElements(FCanvas::ET_Line);
         FBatchedElements* TriangleBatcher = NativeCanvas->GetBatchedElements(FCanvas::ET_Triangle);
         LineBatcher->AddLine(FVector(0, 0, 0), GetActorLocation(), FLinearColor::Green, HitProxyId, 10);

         LineBatcher->AddLine(FVector(0, 0, 0), FVector(100, 0, 0), FLinearColor::Red, HitProxyId, 10);

         TriangleBatcher->AddVertex(FVector(0, 0, 0), FVector2D(0, 0), FLinearColor::Blue, HitProxyId);
         TriangleBatcher->AddVertex(FVector(0, 0, 40), FVector2D(0, 1), FLinearColor::Blue, HitProxyId);
         TriangleBatcher->AddVertex(FVector(0, 100, 0), FVector2D(1, 0), FLinearColor::Blue, HitProxyId);

         TriangleBatcher->AddTriangle(0, 1, 2, GWhiteTexture, SE_BLEND_Opaque);

         TriangleBatcher->AddVertex(FVector(0, 0, 0) - FVector(-100, 0, 0), FVector2D(0, 0), FLinearColor::Red, HitProxyId);
         TriangleBatcher->AddVertex(FVector(0, 0, 40) - FVector(-100, 0, 0), FVector2D(0, 1), FLinearColor::Green, HitProxyId);
         TriangleBatcher->AddVertex(FVector(0, 100, 0) - FVector(-100, 0, 0), FVector2D(1, 0), FLinearColor::Blue, HitProxyId);

         TriangleBatcher->AddTriangle(3, 4, 5, GWhiteTexture, SE_BLEND_Opaque);


All drawing is ignore depth test, cause some weired effects. alt text

I don't know how to enable depth when drawing with Canvas. I need this feature to draw gizmo on top of all scene objects.

Thank you.

Product Version: UE 4.11
20160517163304.png (54.4 kB)
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asked May 17 '16 at 08:44 AM in Rendering

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Henry Read
113 12 14 25

avatar image Henry Read May 18 '16 at 02:22 AM


avatar image WilliamHooper May 18 '16 at 04:59 AM

I'm in blueprints so not sure if this helps... it's a part of another use after checking Disable Depth Test on the Widget3DPassThrumaterial in Engine Materials... after that in widgets: go down to Render Custom Depth pass, enable. And then set Translucency Sort Priority.. (your call) 1000 close - 0 distant maybe something in this can lead ya to an answer...

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1 answer: sort voted first

I used an ugly solution.

I found Canvas just do simple Draw Primitives prcoesses.

I simply write a new class similar to FCanvas. Just create a depth rendertarget. SetRendertarget with the depth rendertarget created. Don't forget to clear the depth before rendering start.

It is just that simple. Then I sucessfully render the 3d gizmo.

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answered May 21 '16 at 04:29 AM

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Henry Read
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avatar image Henry Read May 21 '16 at 04:32 AM

The source codes are part of our company software product. So I can not post here. Sorry.

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