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bengaltgrs

Planar Shadows

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I am trying to create some shadows in my game and thought that planar shadows would work nicely for what I want to do. The only problem I have is that I cannot seem to change the Y position of the shadow using this code from a book I have. // position shadow D3DXVECTOR4 lightDirection(0.707f, -0.707f, 0.707f, 0.0f); D3DXPLANE groundPlane(0.0f, -1.0f, 0.0f, 0.0f); D3DXMATRIX S; D3DXMatrixShadow( &S, &lightDirection, &groundPlane); D3DXMATRIX T; D3DXMatrixTranslation( &T, TeapotPosition.x, TeapotPosition.y, TeapotPosition.z); D3DXMATRIX W = T * S; Device->SetTransform(D3DTS_WORLD, &W); //Render Shadow here The teapot (the object having a shadow cast of it) can move up and down, and the shadow will move about in the X and Z directions just fine, but I want the teapot to be able to move about on a piece of terrain, which means that the Y position of the shadow is going to have to constantly change. I have altered all values that looked as if they may be the right one, but I cannot seem to figure out how to move the shadow up and down in the Y direction. -Chris

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If I understood what you want, the answer is: you cannot. This is why they are called Planar shadows. They just work on the plane and cannot change they Y.

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