@chrisbruk -
Here's a quick re-do of what you have now. I hope you can see things clearly enough.
One important principal in most any OSL project is to keep in mind that the
color of the light being cast. When whatever color you choose is used, make sure to
combine the color of the lit area
and the color of the light. Your blue tank with yellow lights - blue +yellow= green, red + blue = purple etc........... You will most likely need to add a little white...or a lot and make the cone of light (the area the light is falling on) a lighter tone as it gets closer to the lightsource.
The area of the cone of light will do a shift. The closer to the lightsource, the more it will lean towards that color. in the case of your tank, it will be more yellow and lighter. As it gets further from the lightsource it will shift towards blue green and will be darker.........as in closer to what the base of blue is....NOT darker than.
1. If possible, when doing a glowing object, it really helps to try to darken what's surrounding the lightsource.
2. Make the actual light source PURE white. Yellow's one of the few you can do this with.
3. Highlight a narrow area around the light source with a saturated yellow.........keep it narrow.
4. As the light gets further from the lightsource, the edge of the 'cone of light' gets softer. It starts sharp and quickly becomes blurry.
5. Anything that the light will cross will have a cast shadow. Easy way to do this on larger parts is to use, in this case, the blue you've already painted the model. It's tempting to
want to make this area dark. Keep it just the same (light and dark wise) as the rest of the model.
6. Fairly quickly the light will 'run out of gas' and what's left of the cast cone of light will simply, and subtly be the base color with a touch of yellow added.
7. Make the entire cone of light be a COMBINATION of your base color AND the color of the light. If you don't do this the light source will simply look like the source of sprayed
Yellow paint.
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