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About Environment mapping

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I have a question about environment mapping. When i use the perspective projection,I set D3DRS_LOCALVIEWER true to calculate the texture coordinate for environment map.So the reflection image on a sphere(the sphere is in the scene) is affected by viwer. i want to get the reflection image which have no relation with the viewer when i use the perspective projection, so i set LOCALVIEWER false. But the image is not changed. What did i lost to set? or Only when i use orthogonal projection ,i can set D3DRS_LOCALVIEWER false? Thanks in advance! [Edited by - hanhan on September 15, 2004 7:01:46 AM]

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