Help with billboards..

CrazySwede · 2001-06-28T17:30:21

Below is a little testfunction i made for drawing a billboard. Unfortunatly the quaddrawn is tilted against the camera in a very odd way and streches all the way from the position to the camera. As I said, odd. Can anyone see some error with the transposematrix, the quad is drawn correctly if use the location_matrix instead of the transpose as the worldmatrix. But then it isn''t facing the camera of course. Hope you can find something. void CGraphics::RenderBillboard(HTEXTURE hTexture, float fX, float fY, float fZ, float fWidth, float fHeight) { D3DXMATRIX location_matrix, temp_matrix, trans_matrix, view_matrix; m_v3dVerticies[0].tu = 0.0f; m_v3dVerticies[0].tv = 0.0f; m_v3dVerticies[0].position = D3DXVECTOR3(-(fWidth/2), -(fHeight/2), 0.0f); m_v3dVerticies[0].normal = D3DXVECTOR3( 0.0f, 0.0f, -1.0f); m_v3dVerticies[1].tu = 1.0f; m_v3dVerticies[1].tv = 0.0f; m_v3dVerticies[1].position = D3DXVECTOR3( (fWidth/2), -(fHeight/2), 0.0f); m_v3dVerticies[1].normal = D3DXVECTOR3( 0.0f, 0.0f, -1.0f); m_v3dVerticies[2].tu = 0.0f; m_v3dVerticies[2].tv = 1.0f; m_v3dVerticies[2].position = D3DXVECTOR3(-(fWidth/2), (fHeight/2), 0.0f); m_v3dVerticies[2].normal = D3DXVECTOR3( 0.0f, 0.0f, -1.0f); m_v3dVerticies[3].tu = 1.0f; m_v3dVerticies[3].tv = 1.0f; m_v3dVerticies[3].position = D3DXVECTOR3( (fWidth/2), (fHeight/2), 0.0f); m_v3dVerticies[3].normal = D3DXVECTOR3( 0.0f, 0.0f, -1.0f); m_p3DDevice->SetTexture(0, m_pTextureList->Get(hTexture)); D3DXMatrixIdentity(&location_matrix); D3DXMatrixIdentity(&temp_matrix); D3DXMatrixIdentity(&trans_matrix); D3DXMatrixIdentity(&view_matrix); D3DXMatrixTranslation( &location_matrix, fX, fY, fZ); m_p3DDevice->SetTransform(D3DTS_VIEW, m_pCamera->ViewMatrix()); m_p3DDevice->GetTransform(D3DTS_VIEW,&view_matrix); D3DXMatrixTranspose(&trans_matrix, &view_matrix); trans_matrix._41 = location_matrix._41; trans_matrix._42 = location_matrix._42; trans_matrix._43 = location_matrix._43; m_p3DDevice->SetTransform(D3DTS_WORLD, &trans_matrix m_p3DDevice->DrawPrimitiveUP( D3DPT_TRIANGLESTRIP , 2, (void*)&m_v3dVerticies, sizeof(VERTEX3D) }

Graphics and GPU Programming Programming

Started by CrazySwede June 27, 2001 04:58 PM

9 comments, last by CrazySwede 22 years, 9 months ago

Moe

1,256

June 28, 2001 05:30 PM

As soon as I added that one line of code that cleared the certain parts of the tranposed matrix, it worked fine. Now how would I stop it from rotating on the x axis (so I can do things like trees, etc)?

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Help with billboards..

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Help with billboards..

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