Models taking way too long to render

[Edward Poland]

I have a model with two different views. When i went to redner the view it took over 40 min to get through the first pass, The model dosent have a major amount in it. Model is nearly 20mb so too large to attach. Any advice is greatly appreciated.

Thanks Ed

[Roy Hirshkowitz]

You can send the model using the Support->Upload a File option above-- this is your best bet.  Include instructions for how to reproduce the problem (for example, which view to render.)

If you can't do that, keep in mind that it's almost impossible to answer this intelligently without more information.  A picture of what you're getting would probably help.

[Edward Poland]

Thanks Roy just finished work but will upload model first thing in the morning, with instructions.

[Edward Poland]

I have uploaded the model and i also forwarded on the resulting images from both renders.

[Roy Hirshkowitz]

Just got the model.  It's really having fits rendering the roadbed-- AutoCAD is generating lots of really long, skinny triangles.  When I erase the road things go much faster.  Not sure what to do about this one--  it's a good application for Rhino (you'll get a much better mesh automatically.)

Some other items which will improve things (probably not enough without solving the roadbed problem, though):

- Don't use displacement maps for faraway stuff.  Definitely not worth it for the grass in this model.

- Avoid Exterior mode indirect lighting-- use the Path Tracer or Hybrid engines instead.

- Avoid super-high resolutions, the extra processing time is almost never worth it.  Up-sample in Photoshop if you must.