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Projecting 3D coordinates to 2D for text drawing

Graphics and GPU Programming Programming

Started by simonloach July 16, 2007 12:01 PM

1 comment, last by simonloach 16 years, 9 months ago

simonloach

130

Author

July 16, 2007 12:01 PM

I'm trying to draw text on screen using ID3DXFont but this only takes 2D coordinates. So far I've got:

	D3DXMATRIX n = viewmatrix * projectionmatrix;

	D3DXMATRIX textposition3d;
	D3DXMatrixIdentity(&textposition3d);
	D3DXMatrixTranslation(&textposition3d, 6.0f, 0.0f, 0.0f);

	D3DXMATRIX textposition2d = textposition3d * n;

	r->rendertext(L"text on screen", <x coordinate>, <y coordinate>);

I'm not sure whether this is the correct way to go about it and I also have no idea how to extract the coordinates from the textposition2d matrix. Any help would be appreciated :)

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11,840

July 16, 2007 12:04 PM

You can use the handy D3DXVec3Project() function to project a vector from object space to screen space.

simonloach

130

Author

July 16, 2007 12:26 PM

Thanks works perfectly :)

This topic is closed to new replies.

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