Why is Rendering slow?

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Permalink Reply by Render Plus on January 10, 2013 at 8:05am

Has anything changed recently in your model?

Here are some typical items which slow down a model:

Did you turn some geometry into a light? Sometimes making a light our of existing geometry can create too many lights - because sometimes we have to make each face in the light a separate light. In this case it is better to place a light bulb in the light instead.

Did you add trees to your model - trees can really slow down a rendering. If they are background trees, you should use 2D images instead.

Did you add other complex components. Components can slow down a rendering without adding to the size of the model

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Permalink Reply by freddy macalino on January 10, 2013 at 9:21am

heres the rendered pic.

http://forum.irendernxt.com/photo/albums/bathroom-by-ckb-mclain

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Permalink Reply by freddy macalino on January 10, 2013 at 9:34am

Thanks Al , yup your right i download a pendant lamp and turn the bulb into 100 watts light. I replaced it with the bulb instead . 

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Permalink Reply by Bob Bazemore on March 5, 2013 at 11:10am

I have an 80mb file that will never completely render after 8 hours. It has a lot of lights and a lot of custom furniture. What is the best graphics card for your system? I have 4 processors that are maxed out during rendering..

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Permalink Reply by Rich Hart on March 5, 2013 at 11:22am

We don't use the graphics card at all for rendering, so it's just the processor speed and quantity that affects it.

Look at the Statistics dialog (available from the About Box) while it's rendering, and see how many lights we think there are.

Sometimes when you think you have 50 lights, we think you have 500, due to the type of light that they are and how the light geometry gets broken up, as Al was explaining above.

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Permalink Reply by Bob Bazemore on March 5, 2013 at 11:50am

How do I manage the lights then?

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Permalink Reply by Rich Hart on March 5, 2013 at 2:56pm

We didn't seem to have a single source of information about this, so I started a wiki page to talk about this.

You can view it here:

http://wiki.renderplus.com/index.php/Managing_Lights

It's a work in progress. When we get it finished we will add it to the help documentation and add a FAQ that points to it.

We are also going to add a tool which will allow you to identify a component to be a single light, to help with problems where things like chandeliers containing many individual lights are in the model. Then when the single  light is rendered, individual points of lights will be added at each pass at the original light sources in the component, so that it will still illuminate the model in the same way. We'll post a new version when we get that tool finished.

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