Is there a way to figure out the alpha value of a c_trace target or a world position?


Edit: pixel_to_vec(COLOR* color,var alpha,var format,var pixel);
How can I get the position of the pixel? When I use c_trace, I can use vec_for_uv to retrieve a vague position - but I need accurate positions, pixel precise.

Or is there another, maybe easier approach?

Edit2: Maybe this one will lead me to success: "hit.u1, hit.v1"

Edit3: Just to let you know, I´m trying to make the shadowbaker in Loopix´ Mysty Moods alpha compatible.
It should take the alpha values into account.

Edit4: To me it seems, that hit.skin1 isn´t set by c_trace. But it should according to the beta page. Can someone confirm this? --> It´s only set when u use "SCAN_TEXTURE"

Has no one a hint for me?
I´ll go to bed, maybe I´ve some inspiration at night.

Ok, let´s make a brainstorming.
There are no bad or senseless ideas.

How can we _maybe_ get the alpha value of a pixel in the world or object space?

Thanks.

hit.u1, hit.v1 was the correct idea. did you try it with c-script or with lite-c?

it could get a bit tricky though if you trace through a lot of transparent polygons. you would have to recursively call c_trace() again and again until the ray reaches its destination.

I use Lite-C. Yes, it works when I use SCAN_TEXTURE.
But now I´ve the problem that I can´t access hit.skin1 through pixel_to_vec.
It leads to a crash, I think because hit.skin1 is a pointer but no real texture.
Of course I´ve locked it and I´ve made sure that hit.u1 and hit.v1 are not located outside the texture.

Is there a way to get the source texture of hit.skin1? I´ve done some tests, but I wasn´t able to receive the filename so far.

I´m feeling dumb already:

Quote:

---

When c_trace() hits a level block or a model entity in OBB mode, the predefined hit.skin1 pointer is set to the hit BMAP (the lightmap or the first entity skin), and hit.u1,hit.v1 are set to the u,v coordinates of the hit point on the texture. This can be used to paint on the texture, add or remove shadows, or punch holes in targets with a gun.

---

How can I get the pixelvalue of the hit point? I´m getting crashes when I use pixel_to_vec.
But according to the beta page it should be possible...

I'm playing around with all this sort of stuff at the moment...it's pretty tricky

when using pixel_to_vec...are you locking the bmap? I can get it working without crashing:

Code:

---

format = bmap_lock(bmap_terrain_lightmap,0);
if (format >= 565) {
	pixel = pixel_for_bmap(bmap_terrain_lightmap,hit.u1,hit.v1);
	pixel_to_vec(color.blue,result,8888,pixel);
}

---

Are you tracing a model or bsp?

I get an engine crash using 'scan_texture', my levels are models, I'm trying to get the hit.u1 and v1 values.

result = c_trace(vector(my.x,my.y,my.z + my.min_z),vector(my.x,my.y,my.z - 4000),IGNORE_ME|IGNORE_PASSABLE|SCAN_TEXTURE);

Any ideas?

Exactly the same as me.
As soon as I try to use SCAN_TEXTURE. My level contains only models.