I am creating a chandelier with light bulbs inside a glass 'bowl'. When viewed above the bowl, my glowing light material for the bulbs glows just fine. When viewing from the bottom, the glow does not show through the translucent material I used as glass. Thoughts?
Re: Glow Through Transparent Object by Brian Jones on Oct 14, 2008 at 3:35:02 am
Post effects (Glows etc) usually can't be seen through transparency because it is rendered first and glow is added later. Someone has a depth of field plugin that does dof through transparency but I don't know of any that does the same with Glow (which doesn't mean it doesn't exist...)..
Shape will likely be a problem but the glow of a Visible light can be seen through transparency.
Re: Glow Through Transparent Object by Brodd Nesset on Oct 14, 2008 at 7:31:23 am
This is a limitation of the 'Glow' you can add in the standard Material editor. Unlike the other channels, it is not really a channel but a post effect, and it would be tidier if you had to add this type of glow as a tag to the object in question. I guess it's there in the Material editor because it's 'always' been there and out of compability.
You can make two renders: one with the bowl disabled so that the glow will show properly, one with the glass bowl and no glow. Then compose the two in Photoshop (or After Effects) via an appropriate blending mode.
Instead of the glow effect you can make a fog material larger than the flame; yellow fog will appear through glass.
Probably best: you could also render a visible light. Put an actual light source inside the flame, an Omni or perhaps the Tube shape, with Visible light checked and Volumetric selected. Note that with complex settings volumetric light can take a long time to render, so experiment with a low/standard setting first.
Her lips said "no!" but her eyes said "read my lips".
Re: Glow Through Transparent Object by Brian Jones on Oct 14, 2008 at 4:24:08 pm
you can also either turn off Diffuse for the light and it will only have specular highlights left or check off No Illumination - it won't cast any light but you will still see the visible glow.
