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Answer by t0rakka for Why does GL divide `gl_Position` by W for you rather...
It's even simpler; the clipping happens after the vertex shading. If the vertex shader was allowed (or more strongly, mandated) to do perspective divison the clipping would have to happen in...
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Answer by derhass for Why does GL divide `gl_Position` by W for you rather...
I'd like to extent on BDL's answer. It is not only about the perspective interpolation. It is also about the clipping. The space the value gl_Position is supposed to be provided in is called clip...
View ArticleAnswer by BDL for Why does GL divide `gl_Position` by W for you rather than...
The reason is, that not only gl_Position gets divided by the homogeneous coordinate, but also all other interpolated varyings. This is called perspective correct interpolation which requires the...
View ArticleWhy does GL divide `gl_Position` by W for you rather than letting you do it...
Note: I understand the basic math. I understand that the typical perspective function in various math libraries produces a matrix that converts z values from -zNear to -zFar back into -1 to +1 but only...
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