Glow Abrutly Disapeating

[luc-petitot]

Hello all,

I have robot's eye emiiting light. Giving it Glow works perfect when looking in front of it.

When the head of the robot is turning and when the object containing the material that emit glow disapear, the glow goes off abruptly, which is not logical because even if we are not seeing the object emiting light, we should still see the glowing effect produced by the light. Moreover there is a volume fog that is emitting glow as well and when the glow of the light object disapear, it gives an verry disturbing flicking effect in the remaining glow effect of this volume fog.

Someone explained years ago a solution to that problem (changing a sort of "pivot" or reference point, so that the glow remains visible).

Anyone can help ?

Thanks a lot

Luc Petitot

[joojaa]

QUOTE(luc.petitot @ 06/18/08, 04:26 PM) [snapback]287222[/snapback]
When the head of the robot is turning and when the object containing the material that emit glow disapear, the glow goes off abruptly, which is not logical because even if we are not seeing the object emiting light, we should still see the glowing effect produced by the light.

Glow does not emit anything, its a post effect. So what is done is the are of glow is just blurred on the image. If you want the glow to be seen fruther you must render extra pixels and corp the image.

Theres n physical in light emission going on with glow, thats not what glow implies, if you really want thet then your in for a 20times longer render time.

Theres nothing physcally real in glow or most of the stuff yu do in 3d every day. In fact the labertian reflection law isnt even true. Ist a rough guesstimate on how it works. And wrong as it seems.

And by the way even real glow does not emit anything its a lense effect called blloom wich is cased by imperfectness of materials. And yes it dissapears the moment its of your lense. Offcoyrse a true system has a lense tahts sligtly bigger

[luc-petitot]

QUOTE(Joojaa @ 06/18/08, 06:50 AM) [snapback]287226[/snapback]
Theres n physical in light emission going on with glow, thats not what glow implies, if you really want thet then your in for a 20times longer render time.

Is that a solution ? Give it to me if it can help.

Anyway, I know that Glow happens in postprocessing and it is not "real", but:

Somebody gave me a long time ago a solution for this, the following way (as far I remember):
- making a locator
- in the connection editor making a relation between the locator and the material

The problem is that I cannot remember the precise parameters (world matrix ???, no idea) to connect together. These parameters "fake" the material to tell maya that the object on which it is attached to is still visible. That way the Glow remains even if the object is not visible and it doesn't disappear suddenly.

Any idea ?

Thanks,

Luc

[joojaa]

QUOTE(luc.petitot @ 06/18/08, 06:08 PM) [snapback]287229[/snapback]
Is that a solution ? Give it to me if it can help.

read your mr manual on volume emission. You really don want to do this tough.

QUOTE
The problem is that I cannot remember the precise parameters (world matrix ???, no idea) to connect together. These parameters "fake" the material to tell maya that the object on which it is attached to is still visible.

Im not sure i follow

but maybe its this solution and that is to have a transparent film (dont make it trasparent just chek the hide source of the glow on ) that generates the glow on top fo the eye instead. You can then move it about when you come to the extreme angle. Or you can jsut bulge it a bit strategically with either displacement or by calculating the cross of camera along and view direction then move.