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SetClipPlane

Started by Lazy Dec 4, 2011 at 9:39 PM 1 replies 2.1k views

Original Post

Dec 4, 2011 at 9:39 PM

Hi! Im trying to do a simple water shader with reflection. But I just cant get plane clipping to work. Doesn't matter what position or normal I use for my plane, nothing is ever clipped. The water reflects correctly except it also reflects stuff under the water.
Does anyone see any error in the code?

any help is appreciated


 D3DXPLANE clip_plane;
 D3DXPlaneFromPointNormal(&clip_plane, &D3DXVECTOR3(0,-5, 0), &D3DXVECTOR3(0,1,0));
 D3DXPlaneNormalize(&clip_plane, &clip_plane);
 
 D3DXMATRIX view_projection = camera.GetViewProjectionMatrix();
 D3DXMatrixInverse(&view_projection, NULL, &view_projection);
 D3DXMatrixTranspose(&view_projection, &view_projection);
 
 D3DXPLANE view_clip_plane;
 D3DXPlaneTransform(&view_clip_plane, &clip_plane, &view_projection);
 
 NGraphics::GetD3D9Device()->SetClipPlane(0, view_clip_plane);
 NGraphics::GetD3D9Device()->SetRenderState(D3DRS_CLIPPLANEENABLE, D3DCLIPPLANE0);
 
 //I draw the water here

Lazy

Dec 5, 2011 at 9:37 PM

Hmm.. not ok. Works at work on my 8800 GTX. But not at home on my 570 GTX. Very strange.

Lazy

Dec 6, 2011 at 9:30 AM

The solution at home was to check the world position in the Pixel shader and discard; the pixel if it was too low. I guess this is slower... but at least it works.

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