un­der­stand caus­tics

3D World - - TUTORIALS -

Caus­tics are the re­flec­tion and re­frac­tion ef­fect caused by the light trans­mis­sion of a curved ob­ject, such as a glass, which trans­mits ‘caus­tic’ light bands onto a ta­ble top. Caus­tics used to be a com­pu­ta­tion­ally in­ten­sive task and were avoided by many CG artists. How­ever, with the lat­est gen­er­a­tion of ren­der en­gines, caus­tics are now achiev­able for a rel­a­tively low over­head and can re­ally sell a pho­to­re­al­is­tic im­age. Check to see if the ren­der en­gine be­ing used sup­ports caus­tics and take care­ful note of how to set it up, as many have it off by de­fault.

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