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Question by natwales · Oct 11, 2013 at 03:58 PM · shadercg

tex2D in CG program - UVs at 0,0

I'm learning shaders and experimenting using ramp textures and getting strange results when using the (0,0) uv of my texture.

alt text

So using the texture above, instead of black the shader is rendering white:

 float3 ramp = text2D(_RampTex,float2(0));

If however, I change the 0 to .001, then my shader begins rendering black.

 float3 ramp = text2D(_RampTex,float2(.001));

So, my question is, why wouldn't a float2(0) passed as the coordinate render the 0,0 uv of my texture?

ramp1.jpg (2.2 kB)
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avatar image DaveA · Oct 11, 2013 at 03:59 PM 0
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Is the ramp texture clamped?

avatar image natwales · Oct 11, 2013 at 04:13 PM 0
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no. And when it is it works. Thanks

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