View Full Version : glow help

06-18-2003, 10:41 PM
probably the oldest question in the book, but here it goes anyway..

Is it possible to trick LW somehow by whatever technique to cause objects to emit a glow colour different to their surface colour?

06-18-2003, 10:48 PM
No trick, just use Corona amongst the Image Filters instead of Glow. Use the Special buffers to control what surfaces get the effect applied.

06-19-2003, 01:51 AM
with Corona you can even add a texture layer to the glow, including colors!

06-19-2003, 02:44 AM
Try using "AfterGlow" ;)


06-24-2003, 03:07 AM
tried afterglow, didnt seem to work (meaning i didnt know what i was doing).
Corona works really well for the same glow colour as the surface, but I can't get it to emit a different one.
Is there a way to do it using corona?

06-24-2003, 03:20 AM
see the "Edit texture" button in the Corona interface? click it, change the layer to "Gradient" (top right corner drop-down list), then pick a color. You can even have multiple colors, by adding keys to the gradient and giving them a different color. Go crazy.

06-24-2003, 08:37 AM
afterglow works in conjunction with Lighwaves own Glow setup.

setup your object using the default lightwave glow.
Go to the Surface of your glowing object, on the ADVANCED
tab click the Special Buffers button above the Glow box, and enter
any number in the first slot.
Go to the Scene // Image Processing // the Pixel Filter section and add the Afterglow filter. double click on it to open up the pannel.

its interesting but I havent found a use for it. to have a red surface glowing purple washes out the color of the object -
now if it could be Enveloped.....

- Will.

06-24-2003, 12:16 PM
Originally posted by WCameron
its interesting but I havent found a use for it. to have a red surface glowing purple washes out the color of the object - now if it could be Enveloped.....AfterGlow changes the color of the Surface and not the color of the Glow.
It may be useful for fast color glows:
1) Surface -> glow's color
2) AfterGlow -> object's color

It's certainly less useful than Corona but it's usable if you need a fast rendering solution.

Same Object:

without AfterGlow

with AfterGlow


06-24-2003, 08:15 PM

thanks for that! heh

- Will.

06-24-2003, 11:53 PM
am I doing something horribly wrong or is corona just about 25 times slower than using 85 bounce radiosity with 900 rays?

06-25-2003, 12:30 AM
it depends on how much area meets the threshold for the corona. If 90% of the image has a glow to it, it's going to take a long time - but it shouldn't be taking as long as radiosity

06-25-2003, 11:47 AM
Corona provides good results but it's terribly slow! ;)