RatTricks>Using HDR Image In RAT

for Maya

level: all

HDRI

 

 
Introduction
A High-Dynamic Range image is an image that stores the amount of light in the world as floating-point numbers ranging from zero to one million and beyond. Usually the HDR images are created from chrome sphere placed in the live-action sets and used as the representation of the surrounding environment. This is a guide of how to use HDR images to render the effects like environment reflection and image-based environment illumination.
Format Convertion
Here we use the classic uffiz_probe.hdr downloaded form www.debevec.org. Load it into HDRShop, transform from angular map to latitude/longitude map.

 

 

 

 

Beyond Ambient Occlusion
In the earlier tutorials, ambient occlusion passes appeared as grey-scale values. People needed an additional "bent normal" pass to do the environment maps look-ups. I think "ibiD" will ease your life. It is a non-raytrace image-based illumination shader works with dome lights.

>Go to this tutorial

 

Close Window<

 

©Ratttricks