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what does this mean?who can explain to me step by step?

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g_matrixStack->Push(); { g_matrixStack->MultMatrixLocal( &mMoonMatrix ); g_pd3dDevice->SetTransform( D3DTS_WORLD, g_matrixStack->GetTop() ); g_pMoonMesh->DrawSubset(0); } g_matrixStack->Pop();

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I think this interface is confusing. Instead use std::stack class to create your own stack.


On this one, the documentation is not clear. It seems as if this is happening.


>g_matrixStack->Push();

copies the matrix which is the current stack top and pushes it on stack again.

ABC... --> AABC... (if A was stack top)

>g_matrixStack->MultMatrixLocal( &mMoonMatrix );

replaces the current matrix with the product of the given matrix and the current matrix

AABC --> (moon * A) ABC



> g_pd3dDevice->SetTransform( D3DTS_WORLD, g_matrixStack->GetTop() );

update the world matrix to this new matrix

world = moon * A


>g_pMoonMesh->DrawSubset(0);

draw the mesh now


>g_matrixStack->Pop();

discard current top


(moon * A)ABC --> ABC

Therefore my guess is that in order for this to work, A must be the curretn WORLD Matrix.





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