Difference between revisions of "Decal"
EricChadwick (Talk | contribs) (More info, blob shadow example.) |
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For hard-edged decals use "[[Transparency map#Alpha_Test|alpha test]]" because this is usually cheaper to render. If the decals must be softer (tire tracks in a racing game) then use [[Transparency map#Alpha_Blend|alpha blend]] instead. See also [[MultiTexture]]. | For hard-edged decals use "[[Transparency map#Alpha_Test|alpha test]]" because this is usually cheaper to render. If the decals must be softer (tire tracks in a racing game) then use [[Transparency map#Alpha_Blend|alpha blend]] instead. See also [[MultiTexture]]. | ||
| + | Another common use is for blob shadows, which are soft dark circles under a model. Blob shadows are usually faster to render than using shadow-casting lights, and can replicate the look of soft shadowing. | ||
| − | = | + | [[image:blob_shadows.jpg|frame|left|Blob shadow example. Image by [http://ericchadwick.com Eric Chadwick].]]<br clear="all"/> |
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| + | == Tutorials == | ||
[[Image:decals_crytek.png]] <BR> | [[Image:decals_crytek.png]] <BR> | ||
Revision as of 17:43, 25 February 2015
A texture with transparency on a floating polygon, so that it appears to be painted directly on the underlying mesh. When placing decals, care must be taken to avoid Z-Fighting. Decals are commonly used for effects such as bullet marks, graffiti, broken edges, and tire tracks.
For hard-edged decals use "alpha test" because this is usually cheaper to render. If the decals must be softer (tire tracks in a racing game) then use alpha blend instead. See also MultiTexture.
Another common use is for blob shadows, which are soft dark circles under a model. Blob shadows are usually faster to render than using shadow-casting lights, and can replicate the look of soft shadowing.
Tutorials
Using Decals for Destroyed Structures - from the CryENGINE Art Asset Creation Guide - Using alpha blended decals for broken concrete edges.
Broken concrete for CE3 (Tutorial) - by Valdemar 'sltrOlsson' Nyhlén - Video tutorials using Zbrush and Maya to generate tiled maps for broken concrete edges.
Fallout 3 – Edges from Simon Schreibt - Investigating decal usage in Fallout 3.
