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Rendering problems in 2.5D Zbrush4

Hi
I have problem rendering 2.5D image
I need a large image so I’m working in 8192 by 4600
Even if I do half a size, I crash often…

If I render at best it works but if I try to put options like Depth Cue or SoftZ , Zbrush4 crash!

Do I have a maximum poly?
My computer is an Imac 2.8 GHz Intel Core i7, 8G of RAM.

What is the best way to works if large image in 2.5D

Thanks
Fred

You might try saving your document and then splitting it into two renders. The left side of the document is easily accomplished by turning off Document>Pro, dividing the Width slider’s setting by two, then pressing Crop. Do a render.

Now load your document again. In the Layer palette, leave W on and then use a Displace H value that is half your document size. This will offset the document by 50%. Now crop the document to half width again and presto! You’ll have the other half of the document, ready to render.

All that’s left then is to combine the two renders in Photoshop.