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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.


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


draw the mesh now


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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