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Question by b45h05h4 · Mar 25, 2013 at 09:29 AM · shadermathopengl

what the difference between model_View_Matrix and Model_Matrix

as written here http://docs.unity3d.com/Documentation/Components/SL-BuiltinValues.html

float4x4 UNITY_MATRIX_MV Current model*view matrix

float4x4 _Object2World Current model matrix

my question seems a basic one in OpenGL but I am new and not sure where to find the difference an extensive explained reference will be appreciated

Cheers :)

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Answer by whydoidoit · Mar 25, 2013 at 09:51 AM

So:

UNITY_MATRIX_MV Convert the model to the view - as in the Camera is at 0,0,0

UNITY_MATRIX_MVP Convert the model to the projection - including the Camera clip planes, field of view etc

_Object2World Convert the model to the World coordinates - the model vertices are in local coordinates, afterward the position multiplied is in world coordinates

UNITY_MATRIX_IT_MV Inverse of the MV matrix - used to convert normals (directions) to the view

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avatar image whydoidoit · Mar 25, 2013 at 09:52 AM 0
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Check out the Noobs Guide To Shaders on Unity Gems. That has links to a lot of reference works I found too.

avatar image b45h05h4 · Mar 25, 2013 at 09:57 AM 0
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O$$anonymous$$ Thanks a lot

avatar image whydoidoit · Mar 25, 2013 at 09:58 AM 0
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If it works out for you, don't forget to tick the answer :D

avatar image b45h05h4 · Mar 25, 2013 at 10:01 AM 0
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of course :D

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