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188

WebGL Geometry Shader Equivalent?

rated 0 times [ 194] [ 6] / answers: 1 / hits: 18884 / 13 Years ago, tue, december 27, 2011, 12:00:00

I'm currently researching a way to produce non-photorealistic rendering in webgl. The best looking algorithm I've found so far for edge detection was implemented with OpenGL's geometry shader, here. Specifically GL_TRIANGLES_ADJACENCY.

I was wondering if there was an equivalent in WebGL or even how would I go about porting this code over to Javascript.

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jaelynncherokeeg

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answered 13 Years ago kaitlyn · Accepted Answer

Geometry shaders is not available in WebGL.

However there is plenty of ways to do edge detection. E.g. you can use image space based algorithms, such as

http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.93.9731&rep=rep1&type=pdf

Or take a look in Real-time Rendering - 3rd edition (book). In this book there is a lot of examples of NPR, of which most will run fine on WebGL.

http://www.realtimerendering.com/