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

vvvv beta question
1

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 :)

2

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

3

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

4

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

5

Hey,

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

https://discourse.vvvv.org/t/8328

6

tex2Dproj is the one you are looking for:

tex2dproj.zip (2.9 kB)

7

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

8

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

9

the texture sampler modes can be set with something like:

code(lang=hlsl):
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);
};

10

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