Print Page - Specular envmapping

Title: Specular envmapping
Post by: revanic on October 08, 2014, 08:53:27 PM

This is a cross between raven's light direction envmap code and q3's default spheremap for models. Makes sure the model used actually has a light direction aswell. This allows models' envmaps to be modified by BOTH lightdirection AND viewpoint, creating a very nice specular effect. I find it to be better than raven's simple implementation, but then again I may be biased. :P
Should be easy to figure out where this goes in the code.

Code:

if(backEnd.currentEntity && backEnd.currentEntity->e.hModel
		&& (backEnd.currentEntity->lightDir[0] 
	|| backEnd.currentEntity->lightDir[1] 
	|| backEnd.currentEntity->lightDir[2])){ // to prevent faulty things from trying to use this
		hasLightDir = qtrue;
	}

	if(backEnd.currentEntity && backEnd.currentEntity->e.hModel
		&& hasLightDir){
		for (i = 0 ; i < tess.numVertexes ; i++, v += 4, normal += 4, st += 2 ) 
		{// specular envmap
			VectorSubtract (backEnd.or.viewOrigin, v, viewer);
			VectorNormalizeFast (viewer);
			d = DotProduct (normal, viewer);

			reflected[0] = normal[0]*2*d - (viewer[0] + backEnd.currentEntity->lightDir[0]);
			reflected[1] = normal[1]*2*d - (viewer[1] + backEnd.currentEntity->lightDir[1]);
			reflected[2] = normal[2]*2*d - (viewer[2] + backEnd.currentEntity->lightDir[2]);

			st[0] = 0.5 + reflected[1] * 0.5;
			st[1] = 0.5 - reflected[2] * 0.5;
		}
	}
	else{
		for (i = 0 ; i < tess.numVertexes ; i++, v += 4, normal += 4, st += 2 ) 
		{// normal envmap based on raven's setup
			VectorSubtract (backEnd.or.viewOrigin, v, viewer);
			VectorNormalizeFast (viewer);

			d = DotProduct (normal, viewer);

			reflected[0] = normal[0]*2*d - viewer[0];
			reflected[1] = normal[1]*2*d - viewer[1];
			reflected[2] = normal[2]*2*d - viewer[2];

			st[0] = 0.5 + reflected[0] * 0.5;
			st[1] = 0.5 - reflected[1] * 0.5;
		}
	}

Title: Re: Specular envmapping
Post by: fromhell on October 08, 2014, 09:31:58 PM

I actually have something similar implemented for an experimental celshading environmentmap (no relation to the other celshade stuff in the engine backported from zeq2)

Title: Re: Specular envmapping
Post by: revanic on October 08, 2014, 09:42:23 PM

Really? I thought you weren't going to do celshading? Unless it's mostly a test type thing.

Title: Re: Specular envmapping
Post by: fromhell on October 08, 2014, 10:03:07 PM

It was kind of a test type thing.

r_anime would activate it, and try to load shaders prefixed _cel after any shader for an available 'cel' version, and this cel shader would have multiple stages involving tcGen celshading or so.

Title: Re: Specular envmapping
Post by: revanic on November 09, 2014, 12:41:34 PM

I found the code you were talking about in github and i found something:

Code:

 (directedLight[0] + directedLight[1] + directedLight[2] / 3);

I don't know if you changed it already considering this may be old, but the / 3 should go on the outside of the parenthesis. Otherwise it's only dividing directedLight[2] and not the whole thing. Ignore me if you already figured that out :p

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OpenArena Contributions => Development => Topic started by: revanic on October 08, 2014, 08:53:27 PM