TurboCAD Forums

The Ultimate Resource for TurboCAD Knowledge

Register
 
When posting a problem be sure to include which version you are using.  Give as much information as possible.  If the problem is with a specific file be sure to attache it to your post.

Luminance again
Read 2041 times
July 04, 2009, 12:16:06 PM
Hi all.

I have just added an area luminance to a wall mounted strip light.

The Problem is that TC is now taking about 5 times as long to render the model, is this something I am doing wrong or just TC?

Thanks in advance.

Regards

Dave

Logged
Dave C
TC Pro V14.2 - TC 21 Platinum 64 Bit Build 22.3
Intel i-4770K 3.5GHz
120GB ssd 2TB hd
16GB memory
64bit Windows 7 Pro

www.ipernity.com/fizzyfitz


* July 04, 2009, 02:29:31 PM
#1
I have just added an area luminance to a wall mounted strip light.

The Problem is that TC is now taking about 5 times as long to render the model, is this something I am doing wrong or just TC?

It's just TC. "Area" Luminance renders very slowly. Works significantly faster if you can assign the Luminance to a very simple object, such as a thin 3D Box.

Henry H

Logged


July 04, 2009, 03:40:04 PM
#2
Thanks again Henry,

But at the moment I think it's time to just give it up for the night.

I'm slowly losing the will to live when it comes to luminance.

Maybe I'm just not understanding the concept of Luminance lighting.

A simple thing to do, or so I thought.

Model a strip light with a solid cover over three quarters of the light.
Light shines down through the bottom of the cover.

It can't be that difficult!!!!!

Set up an area luminance to the light tube, easy enough.
Light bleeds through the solid light cover onto the wall behind it. Can't figure out why.
I have been sitting here for the last couple of hours playing with settings to no avail.   ???
The reference manual is really not helpful.

I think I will take up something a little less stressful.

Gardening could be good, at least I can light a cigarette outside!!!!!!!!


Regards

Dave

Logged
Dave C
TC Pro V14.2 - TC 21 Platinum 64 Bit Build 22.3
Intel i-4770K 3.5GHz
120GB ssd 2TB hd
16GB memory
64bit Windows 7 Pro

www.ipernity.com/fizzyfitz


* July 04, 2009, 04:13:02 PM
#3
Light bleeds through the solid light cover onto the wall behind it. Can't figure out why.

In the light's Properties dialog, enable Shadows. Beside the Shadow transparency line in the dialog are four icons/boxes. Enable the one on the left ("On") and DISable the other three.

Now the light will shine through transparent objects but not through opaque objects. Therefore you must be sure that one or the other of the following two conditions is fulfilled: a) The Luminance has been assigned to a transparent object; or b) the Luminance has been assigned to a completely separate object (such as a thin 3D Box placed behind the transparent cover) AND "Load to render luminance only" has been enabled for that object.

Henry H

Logged


July 05, 2009, 08:30:06 AM
#4
Hi Henry

I have it sorted now thank you.

Added the luminance to a very thin cylinder inside a glass tube.

This still bled through the solid lamp cover in a v shape up the wall.

It would seam that the glass tube caused this to happen. I have no idea why, but when I removed the glass tube then the luminance worked as it should have done, throwing a light down the wall below the lamp.

Regards
Dave

Logged
Dave C
TC Pro V14.2 - TC 21 Platinum 64 Bit Build 22.3
Intel i-4770K 3.5GHz
120GB ssd 2TB hd
16GB memory
64bit Windows 7 Pro

www.ipernity.com/fizzyfitz