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POHow to perturbate surface normal from height map
 

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  1. POHow to perturbate surface normal from height map
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    <p>I'm working on a bumpmapping implementation in my own 3D tracer. And to be really short - I want this result:</p> <p><img src="https://i.stack.imgur.com/y0PhB.jpg" alt="result wanted"></p> <p>I've been reading pages and pages about bumpmapping, heightmaps, normal maps, ... and I think I understand most of the subject, the difference between all above etc etc. (I got perlin-bumpmapping to work - <a href="http://31.media.tumblr.com/de7103181b9ad82dfa587ad1ac423b35/tumblr_mwmp4qDFG91t0c6bwo1_1280.png" rel="nofollow noreferrer">result</a> ) The only thing I don't get is how to actually perturbate the surface normal from an object given a texture image. Most papers and pages are more than slightly vague on that subject.</p> <p>First I figured you'd just add an image-texture to your object, for a given pixel you'd calculate the rgb color from the texture and then calculated a lightness factor from the rgb value (something like a grayscale value,...) and perturbated the normal with it before adding light effects. - I want(ed) to calculate the normal on the fly.</p> <p><strong>Question</strong>: if the above is even possible: how to perturbate the normal given the lightness-factor? And if I'm wrong here, any tips/links that could help me work my way up to given result would be greatly appreciated.</p> <p><strong>Question 2</strong>: If the above is not possible with any given rgb image, could anyone explain how to perturbate an image given a heightmap? like the first image on <a href="http://en.wikipedia.org/wiki/Bump_mapping" rel="nofollow noreferrer">wikipedia</a> Thanks a lot.</p> <p>P.S: I'm doing/have to do the implementation in Java.</p>
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    1. COThis appears to have some good information in regards to surface normal perturbation: http://www.rorydriscoll.com/2012/01/11/derivative-maps/
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    2. COthanks, looks promising, having a better look tomorrow.
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