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Hi,
EDIT: Scratch what I had before.
I've a scene being rendered from one angle to a rendertarget, and from another to the actual window.However, when I draw to the rendertarget it renders both to the window *and* the rendertarget. All my code uses:
graphicsdevice.setrendertarget(0, [relevantrendertarget])
to change things at the correct places.
Any ideas what's causing this?
Thanks,
Austin K
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You'll need to provide some more code, so we can look at it, and see what's wrong.
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Okay! Problem is that there's a *lot* of it at the moment; this is only a small part of it, but I'll try to post the relevant parts:
Draw code in Game class
| graphics.GraphicsDevice.RenderState.DepthBufferWriteEnable = true; |
| graphics.GraphicsDevice.Clear(ClearOptions.Target | ClearOptions.DepthBuffer, Color.Pink, 1.0f, 0); |
| graphics.GraphicsDevice.SetRenderTarget(0, null); |
[call to draw the terrain with view matrices, camera info, whether to render water and light direction]
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| base.Draw(gameTime); |
| |
Draw code in Terrain class
| Matrix worldMatrix = Matrix.Identity; |
[sets values for the effect file]
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| |
| effect.Begin(); |
| foreach (EffectPass pass in effect.CurrentTechnique.Passes) |
| { |
| pass.Begin(); |
| |
| device.Vertices[0].SetSource(terrVB, 0, VertexFourTextures.SizeInBytes); |
| device.Indices = terrIB; |
| device.VertexDeclaration = terrVD; |
| |
| int noVertices = terrVB.SizeInBytes / VertexFourTextures.SizeInBytes; |
| int noTriangles = terrIB.SizeInBytes / sizeof(int) / 3; |
| device.DrawIndexedPrimitives(PrimitiveType.TriangleList, 0, 0, noVertices, 0, noTriangles); |
| |
| pass.End(); |
| } |
| effect.End(); |
| |
| if (drawWater) |
| water.draw(cameraposition, cameraright, cameratarget, Matrix.Identity, viewMatrix, projMatrix, lightdirection); |
| |
| roads.draw(sand, device, viewMatrix, projMatrix, lightdirection); |
Initialisation of Rendertarget
| reflectionrendertarget = new RenderTarget2D(device, device.PresentationParameters.BackBufferWidth, device.PresentationParameters.BackBufferHeight, 1, device.DisplayMode.Format); |
| |
Drawing of water
| public void draw( Vector3 cameraposition, Vector3 cameraright, Vector3 cameratarget, Matrix camerarotation, Matrix viewmatrix, Matrix projmatrix, Vector3 lightdirection) |
| { |
| [deals with camera positions etc] |
| |
| updatereflection(); |
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| #region Actually draw the water |
| Matrix worldMatrix = Matrix.Identity; |
| [effect parameters] |
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| device.SetRenderTarget(0, null); |
| effect.Begin(); |
| foreach (EffectPass pass in effect.CurrentTechnique.Passes) |
| { |
| pass.Begin(); |
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| device.Vertices[0].SetSource(waterVB, 0, VertexPositionTexture.SizeInBytes); |
| device.VertexDeclaration = waterVD; |
| int noVertices = waterVB.SizeInBytes / VertexPositionTexture.SizeInBytes; |
| device.DrawPrimitives(PrimitiveType.TriangleList, 0, noVertices / 3); |
| |
| pass.End(); |
| } |
| effect.End(); |
| #endregion |
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| } |
Then the part that's actually causing the issue: the rendertargets. These routines are called from the water routine above:
| private void updatereflection() |
| { |
| device.SetRenderTarget(0, reflectionrendertarget); |
| device.Clear(ClearOptions.Target | ClearOptions.DepthBuffer, Color.Black, 1.0f, 0); |
| device.RenderState.DepthBufferWriteEnable = true; |
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| terrain.drawTerrain(false, cameraright, cameraposition, cameratarget + cameraposition, viewmatrix, projmatrix, lightdirection); |
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| device.SetRenderTarget(0, null); |
| } |
I initially thought it was something to do with a spritebatch I was using elsewhere, but I've completely disabled that and it's still
causing the issue.
The weird thing is that if I put a "device.clear(colorx)" call in the "draw terrain" method, it still draws the terrain to the screen and the rendertarget, but the screen's version will all "colorx" (but the meshes etc are still there)!!!
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I'm not really understanding your problem here...what exactly is it that you're drawing to your render target that shouldn't be there? Do you have a screenshot you could show?
Matt Pettineo | DirectX/XNA MVP Ride into The Danger Zone | PIX With XNA Tutorial
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Yeah, sure... I didn't realise quite how unhelpful my second post was until I reread it just now!
I'm creating a city; at the moment it renders a terrain (which is mostly flat, except for the hills outside the city and groves for what will be rivers), a network of roads and some bridges which will eventually go over the rivers.
I'm currently trying to create the rivers, with half-decent looking water. I've found a tutorial on it, done it in a separate project and it all worked fine; so I'm trying to implement it in my city.
At the moment, the game renders the entire city just to the normal screen output (no rendertargets etc). To get the rivers to reflect, I'm also rendering the city from the "reflected" camera point to a rendertarget (with the different viewmatrix for this different camera). The reflecting part works fine; what's drawn to the reflection rendertarget is perfect.
*However*, when I draw the city to this rendertarget for the reflection (from this different viewpoint), it *also* appears on the screen! (screenshot 1 below). If i clear the screen, the geometry remains there but it's all purple (screenshot 2)! The rendertargets are fine and only have the things they're meant to have on them.
Screenshot 1:
Screenshot 2:
This is really bugging me now! I don't know what could possibly be causing it anymore; I've tried everything I can think of!
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you should call updatereflections before any other drawing.
What you do now is the following:
Clear
Draw Terrain
Set a different RenderTarget ***
DrawTerrain
Set to null RenderTarget ***
Draw Roads
The problem happens when you set a different RenderTarget (***). This has the effect of clearing the screen to Purple, and discarding the content of the backbuffer.
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