Bump Mapping

[jojoa1997]

How do I make bump map Textures. Is there a way to do it in gimp or do I have to make them by hand.

[philipbenr]

You can do it in gimp. or in 0.4.8 when it comes out if it has the feature.



look at that. from a scaled and smoothed desert stone to the chunky stone you might see in reality

[spoiler=how 2 in gimp]







[/spoiler]

[jojoa1997]

Oh cool. So how do I get the picture to be red and blue?

[philipbenr]

???
Do you mean how to make an image one certain color?
could you tell me what you mean?

[jojoa1997]

Bump mapping in minetest needs blue and red images. Red for elevated and blue for de-elwvated areas. Look at texture packs with bump mapping and you will see what I mean.

[Mito551]

Bump mapping in minetest needs blue and red images. Red for elevated and blue for de-elwvated areas. Look at texture packs with bump mapping and you will see what I mean.

these are called normals.

[philipbenr]

I will look into it. :)

I didn't know what you meant at first.

[VanessaE]

The colors in a normal map refer to the relative change in elevation from one pixel to the next.

The pixel's green channel (as in RGB) is used for the Y axis, red for the X axis, and blue for the Z axis (depth). This allows a normalmap to store three independent vectors for each pixel. This is also why they have to be PNG or some other lossless format - the channels must not blur/blend together, as would happen with a JPG image.