Moving a 3D object in screen space

Started by Adversus, Apr 15 2011 08:37 AM

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#1 Adversus Members - Reputation: 100

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Posted 15 April 2011 - 08:37 AM

Hi I want to move a 3D object 50 pixels down in the screen and I can't figure out the maths to that.

I have the projection, model and view matrices plus all the screen dimensions. Could some tell me how to do this?

Cheers,
John.

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#2 Mussi Crossbones+ - Reputation: 962

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Posted 15 April 2011 - 03:28 PM

Basically you'll need the object's position to go from model space to world space, from world space to camera space, from camera space to screen space and then reverse the order after you've shifted the screen space coordinate by 50 to get the new position. If you are using using DirectX or OpenGL there are built in functions for this. For DirectX these would be D3DXVec3Project and D3DXVec3Unproject, don't know the OpenGL function names.

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#3 Adversus Members - Reputation: 100

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Posted 19 April 2011 - 08:09 AM

Thanks that worked great.

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