View Full Version : How to make edges glow?

04-22-2008, 07:36 AM
I frequently see biological images with bright edges instead of shadows on the subject. (See sample that I grabbed from a website). Any ideas how to do this in LW? Thanks.

PS. In Photoshop, I would just invert the colors.

04-22-2008, 08:01 AM
Add a gradient on the luminosity of your surface that depends on the incidence angle.
That ought to get you started.


04-22-2008, 08:21 AM
I'll give it a try. Thanks.

04-22-2008, 04:06 PM
You could try fast fresnel on the diffuse with a high glancing angle. Crank it way up to like 400%.

That will be in the "Shaders" tab of your Surface Editor.

Oh, and that's affected directly by lights so move your lights or add lights to get what you want.

04-23-2008, 07:55 PM
I did this real quick on my laptop to see... That incident angle gradient is in the other channels there also (just black and white). I got to playing there so there's a little bump action with the incident angle as an alpha. :p

Oh, and turn off shads.

04-24-2008, 07:10 AM
TvTom: That looks good. I will experiment with it. Thanks for posting.

04-28-2008, 08:59 AM
An incidence basd gradient is my favourite kind, very useful! Also handy for making things reflective at shallow angles only, which is the way the real world tends to work...