Descr effects torch fire.txt

Descr_effects_torch_fire.txt is used in BI to determine the effects used for torches in night battles. M2TW has a similarly structured file called descr_torch_fire.txt.

soldier_torch_fire

This section is an examination of what changes to one particular section do, other sections are similar in many respects so the information should be useful for other parts. Vanilla section:

effect soldier_torch_fire
{
	 type particle
	{
		texture				battlefield/fire/#flame_wheel.tga		
;		texture				models_effects/textures/checker_board.tga
		sprite_origin		0.0, 0.0
		sprite_size			1.0, 1.0

 		size_range       	0.1, 0.1
		age_range        	0.3, 0.3
	    grow_range		 	1.0, 1.0
		vel_range  			0.6, .6
		
		keyframe_colour
		{
;				0.0		255, 255, 255, 255
				0.0, 	0,   236, 242,     0
				0.1, 	255, 236,  242,   0
				0.5, 	255, 236,   149,   22
	 			1.0, 	0,   255,   149,   22
		}
		
		alpha_max	   		255			 ; maximum alpha value
		initial_size		0.2, 0.5
		blend_type			additive
		offset				0.0, 0.0, 0.2
		max_particles       3000

		emitter distance_time
		{
			density			        200 	   	; how many particels per second
			emitter_falloff_dist	100			; distance in meters to reduce emission over
			emitter_falloff_bias	0.5			
			distance_scale  		1
			max_distance			0.2	
			age_scale				0.45		
		}

		random_emit_radius		0, 0.1
		system_radius			2.0			    ; radius used for culling
		batched
	}
}

Messing with sprite origin doesn't do anything useful, leave as 0,0