in opengl, if I want move an object ,a box, I can type:
glPushMatrix();
glTranslatef(x,y,z);
drawBox();
glPopMatrix();
Can someone tell me how to do the same effect in Directx?
How to move object in Directx?
Well you can create a world matrix, which defines the modal space transformations. And then apply it the all the vertices on the current mesh being rendered.
Example:
C++:
D3DXMATRIX worldC, worldT, worldR, worldS;
// Translate Scale Rotate it
D3DXMatrixTranslation(&worldT, tx, ty, tz);
D3DXMatrixRotationYawPitchRoll(&worldR, rx, ry, rz);
D3DXMatrixScaling(&worldS, sx, sy, sz);
worldC = worldR * worldS * worldT;
// Send the matrix to our shader
bff_perObject.worldC = worldC;
.. Send it
VS:
{
..
OUT.position = mul(input.position, worldC);
OUT.position = mul(input.position, viewMatrix);
OUT.position = mul(input.position, projMatrix);
}
No. You need to use a model transformation. SetViewport is for defining which portion of the display to draw to.
Either use world matrix approach as described by Migi0027, or use dynamic vertex buffers. I believe that the first one is faster anyway. First method is similar to OpenGL's shader approach if you are familiar with something different from fixed function pipeline.
If you are using D3D9, you can set your world matrix using:
g_pd3dDevice->SetTransform(D3DTS_WORLD, &mWorld);
However, you will also need to set projection and view matrix.
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