Tutorial: RGBA additive masks

A short tutorial dedicated to a very simple and very useful technique for creating RGBA additive masks

Fix Yeti error to write cache folder: fur the directory doesn't exist!

Some little fix error to write cache temp folder when you try render scenes with Yeti and you get error like this:
ERROR Error writing untitled_pgYetiMaya1Shape_4046108918111904799_1.fur the directory doesn't exist! # 

To fix that error you need write in your Render Settings in Render Option scroll in line Pre Render MEL this:

pgYetiPreRender;

thats all ;)

Yeti and UDIM

Important <UDIM> like Mari UDIMs (.1001., 1002, )

File- path to texture with .<UDIM>. for example C:\Temp\TXT.<UDIM>.tif ; U coordinate no changed- $s , V coordinate need changed to: 

floor($t) + 1 - ($t - floor($t))

see in pic.

If V coordinate leave unchanged (1-$t), there will be an unexpected result over 1001 UDIM.

Convert curves (guide set) to Yeti Groom

If you need convert curves to Yeti Groom, you must create from curves maya Set and know shape name of object the guides are to be growing from. Then type MEL command:

pgYetiConvertGuideSetToGroom( "set1", "pPlaneShape1", "0.2" )

where: set1 - your set name, pPlaneShape1- shape name your object the guides are to be growing from,  0.2-  step size (less value - strands will be more detailed).

Script in action

Download MEL script or this link

Motion blur with Arnold and Yeti

For correct rendering motion blur Yeti fur using Arnold renderer you need set-up correct settings for similar sub-frames. For Yeti cache you need set 5 samples and +1 starting frame longer than the entire sequence (for example, if the sequence start with 1 frame then caching is necessary from frame 0). For example sub-frames for frame=1:

0.5 -- 0.752 -- 1 -- 1.252 -- 1.5

Yeti caching settings:

For Arnold motion blur setting need set Keys=5, Lenght=1 (360 degree) and Center of frame position. For example sub-frames for frame=1:

0.5 -- 0.75 -- 1 -- 1.25 -- 1.5

Motion blur Arnold renderer settings:

Quick test

Mari 3.0 viewport problem (solving problem)

If you use Mari 2.6 and then installed the 3.0 and Mari have problems with the viewport like me, there is a method of treatment.

You need to find the folder .mari on the path C:\ Users\ __USER__\.mari  (Windows 7) and simply rename (if you use prevision version Mari 2.x) or delete it - full reset settings. Or rename/remove *.ini file on the path C:\Users\__USER__\.mari\TheFoundry\Mari.ini. And it's all =)

Nice about composition