Bump map: Difference between revisions
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*[[$bumpmap]], for adding a bump map to a [[material]] | *[[$bumpmap]], for adding a bump map to a [[material]] | ||
*[[Normal Map Creation]] | *[[Normal Map Creation]] | ||
*[[Normal Map Creation in The GIMP]] | **[[Normal Map Creation in The GIMP]] | ||
*[[Normal2dudv]] a third party tool for converting normalmaps to Dx8-friendly [[du/dv maps]]. | *[[Normal2dudv]] a third party tool for converting normalmaps to Dx8-friendly [[du/dv maps]]. | ||
*[http://planetpixelemporium.com/tutorialpages/normal.html An old article that explains the concept well.] | *[http://planetpixelemporium.com/tutorialpages/normal.html An old article that explains the concept well.] | ||
{{otherlang:en}} {{otherlang:en:jp|Creating Normal Maps:jp}} | {{otherlang:en}} {{otherlang:en:jp|Creating Normal Maps:jp}} | ||
[[category:material system]] | [[category:material system]] | ||
[[Category:Glossary]] | [[Category:Glossary]] | ||
Revision as of 06:58, 10 July 2008
A material's albedo (left) compared to its bump map.
A bump map is an RGB image that can be used to simulate a three-dimensional surface through a process known as normal mapping.
Each color channel in a bump map has a meaning:
- The red channel defines horizontal facing (X-axis)
- 0 = left
- 128 = forward (facing viewer)
- 255 = right
- The green channel defines vertical facing (Y-axis)
- 0 = up
- 128 = forward (facing viewer)
- 255 = down
- The blue channel defines height (Z-axis)
- 0 = deepest
- 128 = maximum depth capable of receiving dynamic light (it's a bad idea to go under this)
- 255 = at the material's surface
The three channels between them allow the engine to calculate a normal vector for every pixel, allowing it to generate shadows and highlights on a two-dimensional surface.
A bump map is largely useless for really flat surfaces like smooth concrete or metal, but even rough concrete sometimes has enough depth to it to make one worthwhile.
See also
- $bumpmap, for adding a bump map to a material
- Normal Map Creation
- Normal2dudv a third party tool for converting normalmaps to Dx8-friendly du/dv maps.
- An old article that explains the concept well.