Sorry, I still can't visualize and convince myself that those vertices are anti-clockwise, no matter how I imagine. Maybe I need some reading materials, any links would be greatly appreciated.
Thanks
Jack

Quote:Original post by lucky6969b
Sorry, I still can't visualize and convince myself that those vertices are anti-clockwise, no matter how I imagine. Maybe I need some reading materials, any links would be greatly appreciated.
Thanks
Jack

If the camera is at (0, 0, -50), looking at (0, 0, 0), the vertices look like:

      10,10,10 (0)       ___+___    ---       ---   +--------------+5,0,5 (1)      5,0,15 (2)

So the order 0, 2, 1 is a clockwise order - which is what you want, because anti-clockwise triangles are back-facing and culled (by default).

Quote:Original post by Evil Steve

Quote:Original post by lucky6969b
Sorry, I still can't visualize and convince myself that those vertices are anti-clockwise, no matter how I imagine. Maybe I need some reading materials, any links would be greatly appreciated.
Thanks
Jack

If the camera is at (0, 0, -50), looking at (0, 0, 0), the vertices look like:

      10,10,10 (0)       ___+___    ---       ---   +--------------+5,0,5 (1)      5,0,15 (2)

So the order 0, 2, 1 is a clockwise order - which is what you want, because anti-clockwise triangles are back-facing and culled (by default).

Oh, I was thinking clockwise triangles get culled. Okay, I get it now.
Thanks, its really great help!
Jack

Quote:Original post by Evil SteveIn D3D9, you can change that with SetRenderState(D3DRS_CULLMODE, mode).

The same possibility exists with DirectX 10 too.

typedef struct D3D10_RASTERIZER_DESC {
D3D10_FILL_MODE FillMode;
D3D10_CULL_MODE CullMode;
BOOL FrontCounterClockwise;
INT DepthBias;
FLOAT DepthBiasClamp;
FLOAT SlopeScaledDepthBias;
BOOL DepthClipEnable;
BOOL ScissorEnable;
BOOL MultisampleEnable;
BOOL AntialiasedLineEnable;
} D3D10_RASTERIZER_DESC;

HRESULT ID3D10Device::CreateRasterizerState(
const D3D10_RASTERIZER_DESC *pRasterizerDesc,
ID3D10RasterizerState **ppRasterizerState);