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HLSL shader question: projecting flat texture on mesh if it would be a 2d image

question resolved using-vvvv hlsl texture

cybear 10/02/12 - 06:39

Hello to all!

I have a question regarding the HLSL language.

How do I project a texture on a Mesh treating as it would be a flat 2d image
instead of projecting it around the geometry?

I tried changing the Out.TexCd in the vertex shader and also the
tex2D in the pixelshader, but I didn't find out how to do it.

Anyone has a hint?

Thanks in advance :)

9 replies 0 new

link | Flag this reply as a solution. cybear 10/02/2012 - 19:44

The mesh should be like a mask where the texture is only visible where alpha is not zero.

link | Flag this reply as a solution. DiMiX 10/02/2012 - 19:49

i used to change UV mapping of the geometry (according point of view), maybe there is HLSL way to get the same.

link | Flag this reply as a solution. cybear 10/02/2012 - 19:52

I'm sure that it must be really simple. Unfortunately I'm really a beginner with hlsl...

link | Flag this reply as a solution. readme (node kollaborateur) 10/02/2012 - 22:28

Hey,

this is another approach to it, without hlsl though.
in case you're in a hurry.

gradient-from-dynamic-texture-to-draw-fixed

link | Flagged as solution by cybear. Remove solution flag. tonfilm (devvvv) 11/02/2012 - 00:35

tex2Dproj is the one you are looking for:

application/zip icontex2dproj.zip
link | Flag this reply as a solution. DiMiX 11/02/2012 - 16:41

Thanks tonfilm. that's it.
default shader mode: mirror - would be great to get border mode option as well

link | Flagged as solution by cybear. Remove solution flag. cybear 11/02/2012 - 19:33

Thank you tonfilm! That's it what I was searching! :)

link | Flag this reply as a solution. tonfilm (devvvv) 12/02/2012 - 16:50

the texture sampler modes can be set with something like:

sampler Samp = sampler_state    //sampler for doing the texture-lookup
{
    Texture   = (Tex);          //apply a texture to the sampler
    MipFilter = LINEAR;         //sampler states
    MinFilter = LINEAR;
    MagFilter = LINEAR;
    AddressU = border; //or mirror, wrap, clamp
    AddressV = border; //or mirror, wrap, clamp
    BorderColor = (someColor);
};
link | Flag this reply as a solution. cybear 13/02/2012 - 13:49

Thanks again, but that I always knew. But perhaps it can be useful for others! :)

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