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Making objects glow?
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April 06, 2015, 01:47:47 PM
I'd like to change the attached image from one where the stylized 'O' is lit with a spot light to one where the 'O' glows medium blue; preferably forward, but omni-directional is acceptable.  I seem to recall reading something about this years ago, but cannot find anything.

Setting Luminance has been an abject failure, so where would I find a tutorial to help me with what I want?


Thanks in advance,

Jeff


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April 06, 2015, 02:56:44 PM
#1
Look at Henry's Post a while back here - http://forums.turbocad.com/index.php/topic,15252.msg87845.html#msg87845

Lit appearance in Lightworks may be what you are after that Dean also mentions...

Found the link for Henry's Book that Don posted - http://www.textualcreations.ca/Photorealism_In_TurboCAD(R).zip
« Last Edit: April 06, 2015, 03:03:31 PM by Darrel Durose »

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Daz…

V2019 Plat 64bit, Lenovo P72 Laptop, Window 10 Pro for Workstations, Intel Xeon E-2186 CPU @ 2.90 Ghz (6 cores/12 threads), 32GB RAM, 512GB & 1TB SSD's, Nvidia P5200 c/w Max=Q Design GPU, Display UHD 3840 x 2160 pixels
TurboCAD user since V3 and Turbocad 3D V1.


* April 06, 2015, 03:35:17 PM
#2
I'd like to change the attached image from one where the stylized 'O' is lit with a spot light to one where the 'O' glows medium blue; preferably forward, but omni-directional is acceptable.  I seem to recall reading something about this years ago, but cannot find anything.

Setting Luminance has been an abject failure, so where would I find a tutorial to help me with what I want?


Thanks in advance,

Jeff

Try assigning an "Area" Luminance to the object. But I make no promises.

Henry H

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April 06, 2015, 05:13:11 PM
#3
Try assigning an "Area" Luminance to the object. But I make no promises.

That was my first choice.  Absolutely nothing noticeable (maybe I have to change power to 1000 Watts).    :o

Also tried Single (Point?) & a couple of the Fluorescent settings; no joy with any of them.  The only difference I've noticed is that it takes a lot longer to render.

Will dig out your book now that I've been reminded of the title.


Jeff

« Last Edit: April 06, 2015, 05:14:42 PM by Jeffin90620 »

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April 06, 2015, 06:53:58 PM
#4
That is a really hard affect to get. This is what I tried tonight and then tweaked a bit in Photoshop.

It has a point luminance assigned to the O and plastic glow material.

The last image is what came straight out of TC

PS: This was all done with LightWorks in V21


* April 06, 2015, 07:18:54 PM
#5
Jeff, can you post the .tcw?

Henry H

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* April 06, 2015, 08:36:18 PM
#6
Quite a challenge. Here's my latest attempt...

Henry H

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April 06, 2015, 11:26:14 PM
#7
I'm not getting the same results as Don, probably because I cannot find the popups shown in Screen-0013 and Screen-0014 (I think it's because I don't have the category 'Glows' in my materials).

I did get a decidedly blue glow on the surrounding objects, but not so much the facets of the object itself (hardly surprising in retrospect as all I did was add a light and we don't see lights in renders, only the objects that are lit by those lights).  I was hoping that a Luminance would be different than a standard light, but that doesn't seem to be the case.

Also, I would like to know how Don got that reflection to be so noticeable.


Jeff


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April 07, 2015, 12:26:32 AM
#8
I suppose I could Shell the 'O', then place two copies of the original Polyline (that was extruded to make the 'O') in the hollow area, giving one of them a Luminance and making the other one translucent.

That should make the front facet glow.


Jeff


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* April 07, 2015, 10:16:58 AM
#9
Another stab at it...

Henry H
« Last Edit: April 07, 2015, 10:20:41 AM by Henry Hubich »

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April 07, 2015, 11:18:13 AM
#10
That's pretty durn glowy, Henry.

What did you do to it?


Jeff


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* April 07, 2015, 11:24:46 AM
#11
That's pretty durn glowy, Henry.

What did you do to it?


Jeff

Plugged it in and turned it on ;-)

Here's the drawing...

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April 11, 2015, 05:43:52 PM
#12
Okay... I've played around with the file you posted (after re-directing some file pointers, which is the subject of another post).

Did you render the image you posted using Radiosity?  The closest I could get to your image was to use Quality / Lightworks / Radiosity / Raytrace Full and that takes a while to calculate (easily 5 times longer than Quality / Lightworks / Raytrace Full, but its results were washed out (as if the luminance setting for the letter-shaped object had been beefed up by a factor of 10).


Jeff


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* April 11, 2015, 06:25:06 PM
#13
"Did you render the image you posted using Radiosity? "

Nope. Raytrace Full. Renders in just under five seconds on my ancient machine. I tried Radiosity after reading your message, and the result is virtually identical to RTF, and it takes about ten seconds to render.

Henry H

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April 11, 2015, 10:55:26 PM
#14
Then I'd really like to understand why that mode is so bright on my new system (and not any faster for Raytrace Full and actually slower for Radiosity).

That's not an idle musing... I really want to know.

What video card do you use?


Jeff


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* April 12, 2015, 08:30:08 AM
#15
Then I'd really like to understand why that mode is so bright on my new system (and not any faster for Raytrace Full and actually slower for Radiosity).

That's not an idle musing... I really want to know.

What video card do you use?


Jeff

NVIDIA GeForce GTX 550Ti

Henry H

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April 12, 2015, 08:43:41 AM
#16
Dang... that shouldn't be able to outperform my card (GTX 970).  Maybe my many-cores-but-only-3.3GHz cpu is the problem (not everything TurboCAD 2015 does is hyperthreaded).


Jeff


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April 12, 2015, 08:47:42 AM
#17
Maybe Henry has his Lightworks in the tcw22.ini file set differently to yours Jeff?:

setting UNITSOFLENGHT_FROM_DRAWING to 1 (Built_In\tcw22.ini).


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Daz…

V2019 Plat 64bit, Lenovo P72 Laptop, Window 10 Pro for Workstations, Intel Xeon E-2186 CPU @ 2.90 Ghz (6 cores/12 threads), 32GB RAM, 512GB & 1TB SSD's, Nvidia P5200 c/w Max=Q Design GPU, Display UHD 3840 x 2160 pixels
TurboCAD user since V3 and Turbocad 3D V1.


* April 12, 2015, 10:34:08 AM
#18
Maybe Henry has his Lightworks in the tcw22.ini file set differently to yours Jeff?:

setting UNITSOFLENGHT_FROM_DRAWING to 1 (Built_In\tcw22.ini).

Not positive, but I think that's important only when one or more light sources have a Fall OFF other than "None" or "No attenuation."

Henry H

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April 12, 2015, 05:33:54 PM
#19
Still and all, I have a radical difference in results between Raytrace Full and Radiosity / Raytrace Full.

Other than deleting the Built_In folder, what are my options for resolving this?


Jeff


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* April 12, 2015, 07:23:19 PM
#20
Still and all, I have a radical difference in results between Raytrace Full and Radiosity / Raytrace Full.

Other than deleting the Built_In folder, what are my options for resolving this?


Jeff

Do you really have to resolve it?

...BTW, there's one thing you might want to check, and that's the Luminance Properties of the little sphere above the logo in my drawing. Reason I mention this is that I saved the file in v20 format, and found that in v20 its properties were AFU. Maybe they went sour in your installation, too. "Load to render luminance only" is enabled; color (RGB) is 104,111,200; other properties are shown in the attached screenshot.

Henry H

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