Radiosity Info

sshields · June 19th, 2003

Hello everyone,

First let me start by saying that I visit this site eveyday, and truly value the info on here! Thanks to the people responsible for this site!

On to work stuff...

This image was created in Viz 4 with a linked file to Architectural Desktop. The problem that I am having is with the radiosity process. All of my images look very flat and stagnant. I need some life. A question that I have about the light set up when working with radiostiy is the placement of the light itself. I have included an image of where I have put the light. Is this correct. Also, any help or crits are welcome! Thanks in advance!

Steve
sshields@hixson-inc.com

http://www.cgarchitect.com/forum/fil...=CGA_Image.jpg

Rick Eloy · June 19th, 2003

Hi, Steve!
First, one question: are the fixtures casting shadows? If so, disable this. I believe that the lights being IN the fixtures only makes it harder to set up the radiosity, not to mention the increase of calculation times.
That said, try calculating the scene without the fixtures, with area lights instead of omnis. I guess that'll be a good start.
Be sure to post your updates!
[]
Rick

John Dollus · June 19th, 2003

Are you sure you turned on radiosity? To what percentage did you process it before rendering?

sshields · June 20th, 2003

Thank you guys for getting back to me so fast!! I was experiencing some difficult techniculties (or something like that) but I am back now!

To answer your questions Rick, the fixtures are not casting shadows. The reason that I put the light source in the fixture was because when I put the light at the surface of the ceiling, being an area light, there was no illumination getting to the fixture itself! The light fixture was very dark, even after radiosity! so thinking real-world, I put the light source IN the fixture. This illuminated the fixture and still illuminated the scene. All the lights in the scene are Area - Daylight Fluorescent - I have attached and image showing the params.

http://www.cgarchitect.com/forum/fil...Light_Info.jpg

In all the documentation that I have read about photometric lights, there is very little on placement! So again if you get a chance, I'll take any advice you want to give!!! Thanks again!

John,

Yes, radiosity is turned on, and was processed to 85% I turned the refined iterations to 2. Am I on the right track? Thanks in advance!

Sincerely,

Steve

Uirsu · June 20th, 2003

Hi Steve

Looking at your image, i did not see subdivisions...
what was the size of mesh subdivision of radiosity parameters you used?
And, did you used a raytrace material on the black objects?Its MAX 5 or 5.1?

Hugs
Wilson Iwazawa

sshields · June 23rd, 2003

Hey Wilson,

I did go back and enable the subdivisons after I posted. This provided a better image, but still not quite the level that I am looking for. Can't remember the size right now, but I will look and re-post. Is there a good standard size to use for interior scenes? Maybe a guideline to follow?

The black material is not a raytrace material. It is a standard material with a Blinn shader.

And this is VIZ 4. Thanks for inquiring, and I hope to hear back from you!!

Thanks again,

Steve

nichchris · June 23rd, 2003

Hi sshields,

I have tried to reproduce your situation , and have found this:

and I produced it this way:

1- select light
2- in modifier panel select exclude
3- select the object you want to exclude
4- and finally pass the selection into the exclude list

hope this helps.

nichchris

Uirsu · June 23rd, 2003

try to set about to 10 inches
and post some renders of it
evenif you dont like it yet

sshields · June 24th, 2003

Wilson,

Thanks again for getting back to me!

I went and checked on the subdivisions, and they were set to just over 3 feet. So I dropped that down to 2 feet and recalculated the radiosity with MUCH better results (See Image).

http://www.cgarchitect.com/forum/fil...ect_Image3.jpg

I am going to try them at your suggested 10" and see how that looks. But this does bring up a couple other questions that I have:

1. The translation of curved surfaces from AutoCad to Viz seems BAD! The curved surface turns VERY faceted. Any work arounds on this issue?? If you look at the image that I posted this time, you can see the edges of the worksurface in the foreground.

2. The stock scanline render, from Viz looks good on my screen, but when I use the "Print Size Wizard" to export a TIFF image for Photoshop work, it looks TOTALLY different. It is VERY dark and the shadows seem different. I can post an example if you would like to see.

Can't thank everyone enough for all the wonderful help!! THANK YOU!!!

Steve

Uirsu · June 24th, 2003

Quote:

The translation of curved surfaces from AutoCad to Viz seems BAD! The curved surface turns VERY faceted

hummm...i use to model directly on Max, i hate the cad 3d...i really dont know what can you do, but what kind of curves do you use? (spline, polyline...)

Quote:

The stock scanline render, from Viz looks good on my screen, but when I use the "Print Size Wizard" to export a TIFF image for Photoshop work, it looks TOTALLY different.

I dont know about print size wizard...i use max...

And your image looks far better, post a bigger one...

Hugs

June 19th, 2003	#2 (permalink)
Rick Eloy Moderator Join Date: Apr 2002 Location: São Paulo, Brasil Age: 31 Posts: 2,386 Name: Ricardo Eloy	Hi, Steve! First, one question: are the fixtures casting shadows? If so, disable this. I believe that the lights being IN the fixtures only makes it harder to set up the radiosity, not to mention the increase of calculation times. That said, try calculating the scene without the fixtures, with area lights instead of omnis. I guess that'll be a good start. Be sure to post your updates! [] Rick __________________ Rick Eloy reb digital - Really, I'm doing it for the kids...

June 20th, 2003	#5 (permalink)
Uirsu Senior Member Join Date: Mar 2003 Location: Belo Horizonte Age: 28 Posts: 112 Name: Wilson Iwazawa	Hi Steve Looking at your image, i did not see subdivisions... what was the size of mesh subdivision of radiosity parameters you used? And, did you used a raytrace material on the black objects?Its MAX 5 or 5.1? Hugs Wilson Iwazawa __________________ My portfolio: Virtualmente

June 23rd, 2003	#8 (permalink)
Uirsu Senior Member Join Date: Mar 2003 Location: Belo Horizonte Age: 28 Posts: 112 Name: Wilson Iwazawa	try to set about to 10 inches and post some renders of it evenif you dont like it yet __________________ My portfolio: Virtualmente

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June 19th, 2003	#1 (permalink)
sshields Junior Member Join Date: Nov 2002 Location: Cincinnati, Ohio Posts: 7 Name: Steve Shields	Hello everyone, First let me start by saying that I visit this site eveyday, and truly value the info on here! Thanks to the people responsible for this site! On to work stuff... This image was created in Viz 4 with a linked file to Architectural Desktop. The problem that I am having is with the radiosity process. All of my images look very flat and stagnant. I need some life. A question that I have about the light set up when working with radiostiy is the placement of the light itself. I have included an image of where I have put the light. Is this correct. Also, any help or crits are welcome! Thanks in advance! Steve sshields@hixson-inc.com http://www.cgarchitect.com/forum/fil...=CGA_Image.jpg

June 19th, 2003	#3 (permalink)
John Dollus Veteran Member Join Date: Jun 2002 Location: Tampa Age: 38 Posts: 619 Name: John Dollus	Are you sure you turned on radiosity? To what percentage did you process it before rendering?

June 20th, 2003	#4 (permalink)
sshields Junior Member Join Date: Nov 2002 Location: Cincinnati, Ohio Posts: 7 Name: Steve Shields	Thank you guys for getting back to me so fast!! I was experiencing some difficult techniculties (or something like that) but I am back now! To answer your questions Rick, the fixtures are not casting shadows. The reason that I put the light source in the fixture was because when I put the light at the surface of the ceiling, being an area light, there was no illumination getting to the fixture itself! The light fixture was very dark, even after radiosity! so thinking real-world, I put the light source IN the fixture. This illuminated the fixture and still illuminated the scene. All the lights in the scene are Area - Daylight Fluorescent - I have attached and image showing the params. http://www.cgarchitect.com/forum/fil...Light_Info.jpg In all the documentation that I have read about photometric lights, there is very little on placement! So again if you get a chance, I'll take any advice you want to give!!! Thanks again! John, Yes, radiosity is turned on, and was processed to 85% I turned the refined iterations to 2. Am I on the right track? Thanks in advance! Sincerely, Steve

June 23rd, 2003	#6 (permalink)
sshields Junior Member Join Date: Nov 2002 Location: Cincinnati, Ohio Posts: 7 Name: Steve Shields	Hey Wilson, I did go back and enable the subdivisons after I posted. This provided a better image, but still not quite the level that I am looking for. Can't remember the size right now, but I will look and re-post. Is there a good standard size to use for interior scenes? Maybe a guideline to follow? The black material is not a raytrace material. It is a standard material with a Blinn shader. And this is VIZ 4. Thanks for inquiring, and I hope to hear back from you!! Thanks again, Steve

June 23rd, 2003	#7 (permalink)
nichchris Senior Member Join Date: May 2003 Location: none Posts: 103 Name: nich chris	Hi sshields, I have tried to reproduce your situation , and have found this: and I produced it this way: 1- select light 2- in modifier panel select exclude 3- select the object you want to exclude 4- and finally pass the selection into the exclude list hope this helps. nichchris

June 24th, 2003	#9 (permalink)
sshields Junior Member Join Date: Nov 2002 Location: Cincinnati, Ohio Posts: 7 Name: Steve Shields	Wilson, Thanks again for getting back to me! I went and checked on the subdivisions, and they were set to just over 3 feet. So I dropped that down to 2 feet and recalculated the radiosity with MUCH better results (See Image). http://www.cgarchitect.com/forum/fil...ect_Image3.jpg I am going to try them at your suggested 10" and see how that looks. But this does bring up a couple other questions that I have: 1. The translation of curved surfaces from AutoCad to Viz seems BAD! The curved surface turns VERY faceted. Any work arounds on this issue?? If you look at the image that I posted this time, you can see the edges of the worksurface in the foreground. 2. The stock scanline render, from Viz looks good on my screen, but when I use the "Print Size Wizard" to export a TIFF image for Photoshop work, it looks TOTALLY different. It is VERY dark and the shadows seem different. I can post an example if you would like to see. Can't thank everyone enough for all the wonderful help!! THANK YOU!!! Steve

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