Radiosity

[Bret Bullough]

I have a model which I have created in form-z and I am linking that modek into Viz (dxf). I am having trouble with my radiosity calculation and can't tell if it is the way the file is linked, or rather the settings in radiosity. In the images below t-1, and t-2 shows how surfaces on the same plane are reacting differently to light in the radiosity calc.

 

Now for the kicker t-3 was imported triangulating all faces,using the exact same radiosity sttings(making me think that the first isn't entirly due to radiosity settings) as t1,and t-2, the light consistancy looks good, but all faces become too obvious, regradless of the mapping coords I use.

 

Any ideas on why The first two images have such a poor quality of light consistancy?

 

Any ideas on how I can use t-3 by correcting the triangulating mapping?

 

Thnks for the help

 

http://www.cgarchitect.com/forum/filepush.asp?file=rad-t-1.jpg

http://www.cgarchitect.com/forum/filepush.asp?file=rad-t-2.jpg

http://www.cgarchitect.com/forum/filepush.asp?file=rad-t-3-tri.jpg

[Jeremy Blumel]

I haven't used VIZ, but if it is similar to 3DSMAX, than it looks to me like it could be one or all of the following issues:

 

1) The radiosity Solution Quality is too low - Try raising the quality to 85% or higher.

 

2) The Reflectance and Transmittance properties are too high on some of your materials - Try lowering them by adjusting your HSV values (The V one especially).

 

3) Is the temple modeled in real world units? If not, it would throw off the radiosity solution.

 

On a side note. Great looking picture. The architecture is instantly recognizable. Is this a temple in your area, or another part of the world?

 

Are you registered with an instant messenger, I'd love to chat more about it.

[Bret Bullough]

That's the first thing I thought of I tried one at 85% and it produced the same results, t-3 was calculated at 50% and the light looks much better but mapping is triangulated. I have also tried to bring down the hsv and it doesn't seem to help.

 

No, I don't have instant Mes. but my E-mail is

 

bret@nwlarchitects.com

[proces2]

do you have global meshing turned on for the radiosity?

 

if that doesn't work, try adding a smooth modifier to your objects (don't change or check any of the settings in the modifier - just add it).

 

hope it helps.

[William Alexander]

Bret,

 

Try either reducing the global mesh size, will give better representation of the radiosity gradients on the large wall surfaces. T-3 the dark triangle.

 

or

 

Locally isolate the problem meshes -detach- and in the properties override the global meshing and make it smaller.

 

T-3 I'm assuming is not supposed to have a triangle thats darker, a little too modern for a possible Mormon Temple? This may illustrate the meshing problem.

 

 

http://www.cgarchitect.com/forum/filepush.asp?file=filepush.jpg

 

The orange lines are the adjacent face edges. See the triangles. All faces have light applied to it evenly. The adjacent face has more light applied and is lighter. Increasing the radiosity meshing allows the light to have a gradient transition based on the mesh size. The circled area shows how overlapping faces block light, its darker because the illumination is applied to the whole face, that is shaded by a faces making the cube. Increasing the mesh, smaller mesh size once agian would allow the proper luminance of the surface.

 

Hope this is helpful. It took me a while to figure it out. But what a difference mesh size can make.

 

Temple looks good!

 

rgrds

WDA

[animart]

hello.

For the errors in image A and B, i think that maybe those faces are fliped, go to edit mesh select those faces and flip it. for the image c, maybe the problem is an error for the smoth importing dxf. go to edit mesh select all the adyacent faces who has the problem and cancel the smoth. hope that this help you