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Word co-ords to screen co-ords

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Hi guys

I'm, coding a 3D top down shooter and I want the player to fire in a direction relative to where the mouse and avatar are in screen space.

I thought once I have the two positions I can calculate an angle between them and have the player shoot in that direction.

But I don't know how to convert the world position of the avatar to it's position on screen.

Any insight would be greatly appreciated.

Cheers!
Rob

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