Out Of Memory Problem

[The Fly]

I'm very new to this forum and fairly new to VIZ. I'm trying for the first time to do a Daylight system on an existing model that I had. The model is of an entire building with roads and cars, etc. It was imported from autocad. I was using standard light with this model and it was working fine. I'm now trying to use the daylight system to get a more realistic look but when I go to Render Sceen\Advanced lighting\Radiosity Processing Parameters and hit Start it will come up with a message a few moment later telling me that "The program has run out of memory and will now terminate". My initial quality is set low to 60% and Refine Iterations is at 1. My system is Intel 2.8 with 1 gig of ram. Is this not enough? Could it be that because it is prompting me for missing map files and I just hit continue?

 

Thanks for any advice.

[ihabkal]

radiosity subdivides each mesh so you need more ram......the file gets really heavy...

[Chris_T]

It could be that you've set the mesh resolution to be unecessarily high. Have you enabled Global Subdivision? You'll find that in the Advanced Lighting tab, under the Radiosity Meshing Parameters rollout. Try increasing that number; this will decrease the mesh resolution, and lighten the memory load.

 

If you succesfully complete a solution but you're unhappy with the detail in your bounced lighting, decrease the size of the global subdivision until you reach the desired compromise. You can also give layers or individual objects overriding subdivision settings; this lets you add detail to the lighting where it's needed or reduce meshing where it's not.

 

If you've not touched any meshing settings, it could be that your model is too complex for your system to complete a simulation with the vertexes already present. If this is the case it would help to work out which parts of your model are going to be in view/affect the rendering and which parts you could lose completely.

[Jennifer]

Hi,

 

As Chris said, excluding some things from radiosity processing or changing the subdivision can help greatly. Large surfaces, like grass and parking lots, should be subdivided at a much larger value than the rest of your scene, or excluded altogether from radiosity processing or subdivision. Often times these large surfaces are what put you over.

 

Manually set the subdivision in the Properties | Advanced Lighting for the specific objects, or set it per-layer in the Layer's Properties. Use fake radiosity fill-lights to replace the bounced light from the excluded surfaces IF it will make a difference in your scene. Break off sections of grass/asphalt near your building and set them for radiosity, but exclude the rest, for instance.

 

You can also add a Subdivide modifier to specific objects, if you want direct control. Instancing the modifier helps for common objects.

 

In addition to the radiosity mesh that is created, is the indirect lighting values that are then added to each vertex of the radiosity mesh. VIZ creates the radiosity mesh both for the added subdivision, if used, and because the standard mesh cannot store light information in its vertices. All this adds to a LOT of memory used.

 

Have fun!