Bump/Height map to Ambient Occlusion map by Alex Grain

With this image


your snippet send this error: “A script error ocurred during the rendering”
You can see the solution of the problem here

Snippets with solution

The solution is prevent the división by 0: o/l and o/m I solve the problem with this lines
if l==0 then
div1=o/0.000001
else
div1=o/l
end;
if m==0 then
div2=o/0.000001
else
div2=o/m
end;
local v = get_sample_curve(x, y, H, HI) + (div1)*Lg + (div2)*Mg

Bump_Height map to Ambient Occlusion map.ffxml

Quote
What is this useful for? and why would want to do this conversion? or when would it be good?

Several uses. 1. During rendering, you can save render time by baking ambient occlusion maps into an image hence removing the time to render ambient occlusion all together (in real time or not). There are a bunch of ways of doing this, typically your 3D program bakes maps if you got UVs generated for your 3D models. This method is nice because it lets you generate ambient occlusion via a height map. You can also think about it this way: maybe you just have a height map and you don't want to spend more time messing around with your 3D tools, you just want ambient occlusion off the bat. Well, there you have a method.

2. To add depth / shading to your textures. AO is essentially shading. These aren't like raytraced hard shadows so it's a nice way to add something extra to it. You can use AO to make awfully flat things to look pretty bumpy given it adds some contrast to places where there's occlusion.

3. If you get a bit smart, you can use occlusion layers for adding layers of dust, gunk, grime, junk, melting stuff, whatever to your texture... to give it some wear and tear. The idea's to use ambient occlusion for texturing purposes, hence you can use occlusion to determine where to add all that wear and tear.

4. Oh you know, so many other uses.

Hello.
I have used part of your code to make a new Filter... Thanks!!


Crop Circles Filter