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Question by saxifrage · Dec 26, 2010 at 12:19 PM · shader

How to get an object's position in screen space in pixel shader?

That's the position of the object itself, not the pixel being drawn.

Thanks in advance.

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Answer by femi · Dec 28, 2010 at 12:34 PM

Do you mean the position of object's origin (i.e. (0,0,0) in object's local coordinates)?

#include "UnityCG.cginc" // [...]

// get clip space coords of the origin: //float4 p = mul (UNITY_MATRIX_MVP, float4(0,0,0,1)); float4 p = UNITY_MATRIX_MVP[3]; // equivalent to commented line above but without actual multiplication

// get screen coords from clip space coords: p.xy /= p.w;

After that p.xy is object's screen coordinates (from -1.0 to 1.0). You may also convert to pixels if you care:

p.xy = 0.5*(p.xy+1.0) * _ScreenParams.xy;
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Answer by Paulius-Liekis · Dec 26, 2010 at 02:37 PM

You can take translation part of UNITY_MATRIX_MV (or one of these matrices) - it contains position of the mesh being draw. Otherwise you'll have to pass it as param to the shader.

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