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DirectX 8.1 on nVidia Quadro FX 1300 problem!
Hi All,
we designed a 3D medical project for CT and MR to draw a scene using three different pixel shaders. It works on any video cards(Such as nVidia, Matrox, ATI, etc.) on 32bit machine properly and under any OSs. But it looks weird on nVidia Quadro FX 1300 on Dell Workstation 370( 64 bits machine). The brief description about drawing is like: - Clear 3D device - BeginScene - Select pixel shader A; Draw something - Select pixel shader B; Draw something - Select pixel shader C; Draw something - EndScene - Present The weird performance looks like current scene is previous scene, sometimes two scenes are mixed up. What causes the problem? Does PCI Express card cause the problem? Does new feature of new so-called generation nVidia card cause the problem? When I draw three different parts of one texture on three different viewports using three DrawPrimitive, it appears same part of the texture on the screen. But when I draw the three different parts of one texture on same viewport using only one DrawPrimitive, it works properly. yulong |
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