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# Can someone doing frustum culling in Direct3D 8/9 please give a little code?

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Hey there. I''ve been trying to get this working for a while. I posted on this subject once, but I didn''t get the correct response. A few people responded, and they offered some help, but it wasn''t what I needed. Anyhow, I am trying to do frustum culling in Direct3D 8. I do not perform any transformations on my world matrix (D3DTS_WORLD). I am transforming the view matrix, using the eye, look-at, and up vectors. I do not know how to correctly extract the six planes for the view frustum. Well, I know how to SETUP the planes, but I do not know which matrices to multiply before I do the extraction. Would it be: World · View View · Projection or World · View · Projection Any answers or a code for setting up a frustum would be greatly appreciated. Thanks everyone.

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http://www.flipcode.com/articles/article_frustumculling.shtml should answer any most questions. If there is something specific not answered in there (or either of it''s associated linked articles), then ask away... I''m sure someone will be able to help when we know exactly where your trouble lies.

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Here's what i do
	D3DXMATRIX matView;	D3DXMatrixLookAtLH( &matView, &Camera.from,&Camera.to,&Camera.up);	d3ddevice->SetTransform( D3DTS_VIEW, &matView );	D3DXMATRIX matProj;	D3DXMatrixPerspectiveFovLH(&matProj, 1.0f, 1.0f, 0.01f, 1000.0f);	d3ddevice->SetTransform(D3DTS_PROJECTION, &matProj);		//calculate the vectors and planes for the frustrim	D3DXMATRIX mat;	D3DXMatrixMultiply( &mat, &matView, &matProj );	D3DXMatrixInverse( &mat, NULL, &mat );    vecFrustum[0] = D3DXVECTOR3(-1.0f, -1.0f,  0.0f); // xyz    vecFrustum[1] = D3DXVECTOR3( 1.0f, -1.0f,  0.0f); // Xyz    vecFrustum[2] = D3DXVECTOR3(-1.0f,  1.0f,  0.0f); // xYz    vecFrustum[3] = D3DXVECTOR3( 1.0f,  1.0f,  0.0f); // XYz    vecFrustum[4] = D3DXVECTOR3(-1.0f, -1.0f,  1.0f); // xyZ    vecFrustum[5] = D3DXVECTOR3( 1.0f, -1.0f,  1.0f); // XyZ    vecFrustum[6] = D3DXVECTOR3(-1.0f,  1.0f,  1.0f); // xYZ    vecFrustum[7] = D3DXVECTOR3( 1.0f,  1.0f,  1.0f); // XYZ    for( INT i = 0; i < 8; i++ )	{        D3DXVec3TransformCoord( &vecFrustum[i], &vecFrustum[i], &mat );	}    D3DXPlaneFromPoints( &planeFrustum[0], &vecFrustum[0], &vecFrustum[1], &vecFrustum[2] ); // Near    D3DXPlaneFromPoints( &planeFrustum[1], &vecFrustum[6], &vecFrustum[7], &vecFrustum[5] ); // Far    D3DXPlaneFromPoints( &planeFrustum[2], &vecFrustum[2], &vecFrustum[6], &vecFrustum[4] ); // Left    D3DXPlaneFromPoints( &planeFrustum[3], &vecFrustum[7], &vecFrustum[3], &vecFrustum[5] ); // Right    D3DXPlaneFromPoints( &planeFrustum[4], &vecFrustum[2], &vecFrustum[3], &vecFrustum[6] ); // Top    D3DXPlaneFromPoints( &planeFrustum[5], &vecFrustum[1], &vecFrustum[0], &vecFrustum[4] ); // Bottom	//transform the frustum plane into world space	for(i=0;i<6;i++)	{		D3DXPlaneTransform(&WorldplaneFrustum[i],&planeFrustum[i],&mat); 	}

just look at the cull example in the sdk

[edited by - kapru on March 22, 2004 10:44:27 PM]

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