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I'm doing a project in cycles and I want to render it but its too slow on my CPU. So I want to render the scene in luxrender but without starting the project all over again.

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    $\begingroup$ You can recycle the geometry but as far as I know you will have to rebuild your materials from scratch. Just copy your scene with Link Object Data option and then start replacing materials one by one. You can select multiple objects that use the same material and press 'Ctrl+L' > Link Materials to make them use the same material $\endgroup$ – Duarte Farrajota Ramos Jul 19 '16 at 14:36
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Luxrender in version 1.6 (latest iteration) offers a basic material converter. Check out the release notes on the Luxrender Site here (scroll down to the last entry): http://www.luxrender.net/wiki/New_in_1-6

The button to convert all materials is in the render tab:

convert all

to convert elements individually, do a space bar search in the 3D viewport. Hit Space and enter 'convert' gives you these functions:

spacebar menu

Disclaimer: If this makes your renderings FASTER I'm not sure. It depends on the scene and the aim. But it gives you a quicker starting point.

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