Hi

I am very bad in shader programming so i have a question. I want to make an uv shifting effect including alpha channel (it should be shifted too). It is for a moving train level. I tried out the example from wiki, but it does not shift the alpha channel. could someone help mee (excpecially HeelX, who wrote the example).

Thanks a lot.

I did that once, its a very nice effect, they only issue with it is it makes the seams on any model very visible, too bad I don't still have the shader.... If I have time I'll try and rewrite it for you, but I'm pretty busy this week.

Would be great!

Here is the shader i use until now. It should shift alpha channel too:

function mtl_UV_alphaClamp_event ();
material mtl_UV_alphaClamp {

event = mtl_UV_alphaClamp_event;
effect = "
matrix matMtl;
extern texture entSkin1;

technique uvspeed
{
pass p0
{
Texture[0] = <entSkin1>;
ColorOp[0] = Subtract;

Texture[1] = <entSkin1>;
ColorOp[1] = SelectArg1;
TextureTransform[1] = <matMtl>;
TextureTransformFlags[1] = Count2;
}
}";
}

function mtl_UV_alphaClamp_event ()
{
mat_identity(mtl.matrix);
mtl.ENABLE_RENDER = on;
mtl.matrix31 = floatd(my.skill1, 256);
mtl.matrix32 = floatd(my.skill2, 256);
}

action bla ()
{
my.material = mtl_UV_alphaClamp;

while (1) {
my.skill1 += 5 * time_step;
my.skill2 += 2 * time_step;
wait(1);
}
}

i think your shader does shift the base texture and uses the alpha information to clamp it.

Yes, i know. But how to shift the alpha channel too? Please help!

There is such a material in the mtlFX.c / uvspeed.fx.

Hey...co-patriote! This is not tested but I woulden't know why it shoulden't work...


Code:

---

...
 technique uvspeed
{
pass p0
{
Texture[0] = <entSkin1>;
ColorOp[0] = Subtract;
TextureTransform[0] = <matMtl>;
TextureTransformFlags[0] = Count2;

Texture[1] = <entSkin1>;
ColorOp[1] = SelectArg1;
TextureTransform[1] = <matMtl>;
TextureTransformFlags[1] = Count2;
}
}";
}
...
  

---

Thanks a lot, really nice. I will try it soon and post the result here!

Woooow, great, it works purrrfekt!!!!!!!!!!!!!

Again, thanks a lot!

Has anybody got this to run under A7.5? My texture flickers but does not move.

I changed the render event to

function mtl_UV_alphaClamp_event ()
{
mat_identity(mtl.matrix);
mtl->flags |= ENABLE_RENDER;
(mtl->matrix)[7] = my.skill1 / 256;
(mtl->matrix)[8] = my.skill2 / 256;
}