Video:Here
By: IwX
xfire: alien3585
This model not free!!!

Some scripting stuff for you:

make_new_playerangle(normal_in,normal_out,playerangles)
{
	playervec=anglestoforward(playerangles);
	
	normal_both=cross_prod(out,in); //do not write in,out, it fucks stuff up

	if(normal_both==(0,0,0))
	{
		if(dot_prod(normal_in,normal_out)>0)
		{
			//portal_normals are pointing in same direction, turn vec around
			output=maps\mp\_utility::vectorscale(playervec,-1);
		}
		else
		{
			//portal normals are opposite, portals are facing one another, do nothing to playervec
			output=playervec;
		}
		//both portal_normals are paralleled
		//do something here
	}
	else
	{
		normal_in2=cross_prod(normal_in,normal_both);
		normal_out2=cross_prod(normal_both,normal_out);

		normal_both=vectornormalize(normal_both);
		normal_in2=vectornormalize(normal_in2);
		normal_out2=vectornormalize(normal_out2);

		part_normal=dot_prod(normal_in,playervec);
		part_right=dot_prod(normal_in2,playervec);
		part_up=dot_prod(normal_both,playervec);	

		vec_part_up_out=maps\mp\_utility::vectorscale(normal_both*part_up);
		vec_part_right_out=maps\mp\_utility::vectorscale(normal_out2,part_right);
		vec_part_normal_out=maps\mp\_utility::vectorscale(normal_out,-1*part_normal);
		output=vec_part_up_out+vec_part_right_out+vec_part_normal_out;
	}
	return output;
}



calc_other_vecs(trace,user)
{
	uservec=anglestoforward(user getplayerangles());
	up=vectornormalize(uservec-maps\mp\_utility::vectorscale(trace["normal"],dot_prod(trace["normal"],uservec));
	right=cross_prod(up,trace["normal"]);
}


cross_prod(vec1,vec2)
{
	return ((vec1[1]*vec2[2]-vec1[2]*vec2[1]),(vec1[2]*vec2[0]-vec1[0]*vec2[2]),(vec1[0]*vec2[1]-vec1[1]*vec2[0]));
}

dot_prod(vec1,vec2)
{
	return (vec1[0]*vec2[0]+vec1[1]*vec2[1]+vec1[2]*vec2[2]);
}

and

player()
{
	self endon("disconnect");
	self endon("killed_player");
	self endon("spawned_player");


	self.firstportal=undefined;
	self.secondportal=undefined;


	self.oldorg=self.origin;
	for(;;)
	{
		if(isdefined(self.firstportal)&&isdefined(self.secondportal))
		{
			//check for proximity to portals here
			//firstportal:
			S=self.origin-self.firstportal.origin;
			R=s-maps\mp\_utility::vectorscale(self.firstportal.normal,dot(self.firstportal.normal,s));
			if(distancesquared(R,(0,0,0))<100*100)
			{
				//lined up in front of the portal
				if(dot(S,self.firstportal.normal)>0)
				{
					//located at the right side of the portal
					if(dot(maps\mp\_utility::vectorscale(self.oldorg-self.origin,1.5)+S,self.firstportal.normal)<0)
					{
						//walking for 0.075 sec in that same direction should let you bump into the portal
						self.origin=self.secondportal.origin;
						speed=distance(self.oldorg,self.origin);
						damage=int(speed);
						self.health+=damage;
						vdir=self.secondportal.normal;
						//do some damage here in the self.secondportal.normal direction, depending on speed
						self.oldorg=self.origin;
					}
				}
			}
			//secondportal:
			S=self.origin-self.secondportal.origin;
			R=s-maps\mp\_utility::vectorscale(self.secondportal.normal,dot(self.secondportal.normal,s));
			if(distancesquared(R,(0,0,0))<100*100)
			{
				//lined up in front of the portal
				if(dot(S,self.secondportal.normal)>0)
				{
					//located at the right side of the portal
					if(dot(maps\mp\_utility::vectorscale(self.oldorg-self.origin,1.5)+S,self.secondportal.normal)<0)
					{
						//walking for 0.075 sec in that same direction should let you bump into the portal
						self.origin=self.firstportal.origin;
						speed=distance(self.oldorg,self.origin);
						damage=int(speed);
						self.health+=damage;
						vdir=self.firstportal.normal;
						//do some damage here in the self.firstportal.normal direction, depending on speed
						self.oldorg=self.origin;
					}
				}
			}
			
		}
		self.oldorg=self.origin;
		wait 0.05;
	}
}
dot(vec1,vec2)
{
	if(!isdefined(vec1)||!isdefined(vec2))
		return 0;
	else
		return vec1[0]*vec2[0]+vec1[1]*vec2[1]+vec1[2]*vec2[2];
}

This code is free-to-use, if you credit me in the main menu OR in the hud, and add some credits to the readme.txt in the clientiwd