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terrain texturing

Started by supagu Feb 2, 2004 at 6:44 PM 3 replies 650+ views

Original Post

Feb 2, 2004 at 6:44 PM

hi, currently i render my terrain through multipass texturing and a shader. i have a blend map, each color channel is encoded with how much of each texture to blend and i have 3 textures that are tiled and blended so red = 255 would mean texture a would be 100% visible red = 120 blue = 120 green = 15 would result in roughly 50/50 of texture a and b with a small bit og texture c showing through.... is there a way i can do this with out a shader in a single pass using dx blend operations?

Raloth

Feb 2, 2004 at 7:36 PM

Yes, but unfortunately, you would need a separate texture for each blending map. The pixel shader approach is what I do and it works pretty well

. You can use the alpha channel in the textures (not the blend map) as a detail map and scale its texture coordinates up (so it repeats more) and then combine it with the unscaled value for super-detail.

supagu

Author

supagu

Feb 3, 2004 at 6:15 AM

hrmm i was thinking of the detail map or maybe a clouds moving across the terrain image
:| hard choice ;p

treething

Feb 3, 2004 at 10:41 AM

You can do it without a shader, but it wont be in a single pass. You have to use the dot3 texture operation to extract a color channel to use for blending. On most hardware it will take 2 or 3 passes.

supagu

Author

supagu

Feb 3, 2004 at 8:14 PM

hrmm maybe i should divide my terrain up, so only 2 textures can be on 1 poly at once? that way i dont rely on shaders so it works on older hardware...
this would be hard to work out tho especially as im currently exporting from 3d MAX :-/

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