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Question by azer89 · Jul 23, 2012 at 06:59 PM · shadercustom-shader

How to obtain result from previous Pass

Hi, i want to implement simple Gaussian blur and i blur vertical and horizontal parts separately in the second pass it seems my code uses the original texture instead from previous pass's result

here's my code:

GaussianBlurCode

In the image below, as you can see the result is the combination of two passses alt text

gaussianblurfail.png (199.4 kB)
gaussianblurpassquestion.txt (3.8 kB)
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Answer by ScroodgeM · Jul 23, 2012 at 07:05 PM

if you use two or more passes, shader's parameters that are comes on pass input are the same for all passes. so you can't change the _MainTex in one pass and use _MainTex with these changes in another pass. _MainTex comes without changes to the second pass. so you should use Blending between passes to combine results or pack all calculations to a sigle pass.

it's a shader's hardware limit. all shaders are executed in parralel threads so you can't make sequential calculations

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Answer by azer89 · Aug 07, 2012 at 02:29 AM

found the solution, simply use this: http://docs.unity3d.com/Documentation/ScriptReference/Graphics.Blit.html

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avatar image pointcube · Apr 22, 2013 at 01:09 PM 0
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Can you explain how did you do this ? I would help me. Thanks.

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