Hi,

it is possible to apply a texture on a surface that is not put on the surface? So that the texture is looking plain on the screen but only in the surface.

Which matrix must be used?

use something like

texCoord.xy=oPos.xy; while oPos contains the mul(position,matWorldViewProj);

untested, but i think thats what it was like

Hi,

it don´t gives the wanted result.



I don´t want the texture on the left, i want a plain texture in the shape of the face.

I try to make a "volumic fog" mixed from the normal fog and a fog texture plain on the blocks with a an alpha from the bottom to the top, so higher it is, it get´s more alpha. It´s just a test, maybe it looks terrible.

Exmaple:
( in.pos is POSITION semantic, out.tex0 is a float3 output TEXCOORD semantic)

VERTEX SHADER:
float4 toScreen = mul(float4(pos.xyz,1),matWorldViewProj);
out.tex0.x = 0.5f * (toScreen.z+toScreen.x);
out.tex0.y = 0.5f * (toScreen.z-toScreen.y);
out.tex0.z = 1.0f * toScreen.w;

PIXEL SHADER:
float2 screenCoords;
screenCoords.x = in.tex0.x/in.tex0.z;
screenCoords.y = in.tex0.y/in.tex0.z;
float4 screenSpaceSample = tex2D( screenprojSampler, screenCoords.xy );

You should be able to figure it out with that, just adjust your variable names for the inputs and outputs, as well as the texture read. This requires PS2.0, you can change it so it divides the coordinates by the w component in the VS to bring it down to 1.0, but that will cause artifacts on the edges of the screen. I'm working on a workaround for that right now... I'll let you know if I figure a way out.

-Rhuarc

Rhuarc, thank you very much to push me back on track.

No problem!