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Gilzu

drawing vertexes with delta?

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duh... i'm doing my own mesh lib, and using the following:
  
void CMeshLib::Render(float dx, float dy, float dz)
{
	Vert *vtxQuad;
	vbsrc->Lock(0,0, (BYTE **)&vtxQuad, NULL);
	for(int i=0; i<NumVectors; i++) {
		vtxQuad[i].x+=dx;
		vtxQuad[i].y+=dy;
		vtxQuad[i].z+=dz;
	};
	vbsrc->Unlock();

	g_pd3dDevice->SetVertexShader(D3DFVF_DIFFUSE|D3DFVF_XYZ|D3DFVF_NORMAL);
	g_pd3dDevice->SetStreamSource(0, vbsrc, sizeof(Vert));
	g_pd3dDevice->ProcessVertices(0,0,NumVectors,vbdest,0);

	g_pd3dDevice->SetVertexShader(D3DFVF_DIFFUSE|D3DFVF_XYZRHW);
	g_pd3dDevice->SetStreamSource(0, vbdest, sizeof(DVert));
	g_pd3dDevice->DrawPrimitive(D3DPT_TRIANGLELIST, 0, NumVectors/3);
	vbsrc->Lock(0,0, (BYTE **)&vtxQuad, NULL);
	for(i=0; i<NumVectors; i++) {
		vtxQuad[i].x-=dx;
		vtxQuad[i].y-=dy;
		vtxQuad[i].z-=dz;
	};
	vbsrc->Unlock();
}
  
is there any better way than changing the vertexes each time? [edited by - gilzu on August 15, 2002 5:49:22 PM]

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You''ll need to get rid of the lock/unlock calls that orient the mesh in world space. Use a world transformation matrix instead. Look up in the DX SDK (8.x) under DirectX Graphics > Programmers Guide > Getting Started with Direct3D > DirectX Graphics C/C++ Tutorials > Tutorial 3: Using Matrices.

Also, there is no reason to call ProcessVertices, the pipeline will take care of that for you.

Try this instead:


  
void CMyMeshLib::Render(float dx, float dy, float dz)
{
D3DXMATRIX matWorld;
D3DXMatrixTranslation(&matWorld, dx, dy, dz);
g_pd3dDevice->SetTransform(D3DTS_WORLD, &matWorld);

g_pd3dDevice->SetVertexShader(D3DFVF_DIFFUSE|D3DFVF_XYZ|D3DFVF_NORMAL);
g_pd3dDevice->SetStreamSource(0, vbsrc, sizeof(Vert));

// Turn off textures unless you''re not using them or they are already off


g_pd3dDevice->DrawPrimitive(D3DPT_TRIANGLELIST, 0, NumVectors/3);
}

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