Adding Glow

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What is glow

Glow is an effect that 'overdraws' a certain texture so it looks like it glows by lighting.

Credits

The scripts and ideas were from nikki from this thread: http://www.ogre3d.org/forums/viewtopic.php?f=2&t=52316&start=0

Examples

• 

  Glow disabled

• 

  Glow enabled (plus HDR)

• 

  Lights off

• 

  Lights on, Glow disabled

• 

  Lights on, Glow enabled

• W900 with glow materials: Media:W900_with_glow.zip

Requirements

latest RoR version, which includes the glow feature.

How to add glow to truck flares

if you know how to add materialflarebindings its relatively easy:

• ensure the materialflarebinding is working
• for example we take this material as example:

material AC3D/Box5W900/Mat004_NoTex
{
	technique
	{
		pass
		{
			emissive 1 1 1 0.3
			texture_unit
			{
				anim_texture W900_headlight_material.png 2 0
			}
		}
	}
}

• add the default glow scheme technique (you don't need to change any values except the texture)

material AC3D/Box5W900/Mat004_NoTex
{
	technique
	{
		pass
		{
			emissive 1 1 1 0.3
			texture_unit
			{
				anim_texture W900_headlight_material.png 2 0
			}
		}
	}
	technique
	{
		scheme glow
		pass
		{
			texture_unit
			{
				texture W900_headlight_material_1.png
			}
			ambient 0 0 0
			diffuse 0 0 0
			specular 0 0 0 1
			emissive 0 0 0
		}
	}
}

• change the texture of the glowing technique to reflect the image you used for your headlights. (you should use the 'on' state)

• start the game with "Glow=Yes" in your RoR.cfg. and test if the material glows.

How to add glow to any other objects

• you can add glow to any object you want, just use the technique from above. The Ambient and diffuse colour value will define the glow-amount.

Example

• exchange the master material in resources/materials.zip / tracks.material:
• original:

material tracks/master
{
	technique
	{
		pass
		{
			texture_unit
			{
				texture master.dds
			}
		}
	}
}

• new with glow:

material tracks/master
{
	technique
	{
		pass
		{
			texture_unit
			{
				texture master.dds
			}
		}
	}
	technique
	{
		scheme glow
		pass
		{
			texture_unit
			{
				texture Random_glow.png
			}
			ambient 0.5 0.5 0.5
			diffuse 1 1 1
			specular 0 0 0 1
			emissive 0 0 0
		}
	}
}

• add this image to your materials.zip: Random_glow.png
• you should get something like this:

Advanced things

Debug glow

You can test if things are glowing directly by changing the .cg script that combines the glow with the scene:

• Find the glow.cg script (in materials.zip in resources) and change "#define RENDER_SCENE 1" to "#define RENDER_SCENE 0"
• this will only render glowing parts in game. Everything non-glowing will be black. You should see something like this:

glow debugging: only render glowing objects