Tutorial: Nontrivial use of the Shader node in Yeti 3

Short tips and tricks video about use Shader node in Yeti3
Method in action

Maya example scene (Maya 2018, Yeti 3.1.X)   

I hope this information will be useful to you

Tutorial: RGBA additive masks

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

Yeti and Arnold or V-Ray motion blur bug fix

If you need to get a working motion blur using V-Ray or Arnold and you have had such problems:

V-ray (normal/with bug)

you need to make a few changes.
If you use in your Yeti tree any expressions with Position attribute (P) then you need:
For Yeti 2.1.xx
1. for all objects from which you get P attribute you need create texture reference objects;
2. replace all P on Pref
For Yeti 2.2
1. the same step as for Yeti 2.1.xx
2. P -> Pundef

If you have this bug and you use VRay, then render time increase approximately x3.3

nvoglv64.dll crash Maya 2017 - Solution to the problem

If during the rendering by Arnold (using IPR Arnold RenderView) your Maya dies and the screen blinks and you find such an error

 then you need to set for Maya app. in Nvidia Control Panel: 3D Settings\Manage 3D settings:

OpenGL Rendering GPU - << select your card in list >>
Power management mode - Prefer maximum performance
Vertical sync - Use the 3D application setting
Maximum pre-rendered frames - Use the 3D application setting

in my cases it was with Maya 2017 Update 4 and Nvidia driver version 385.41

if I correctly understood this is due to the fact that during the time of work in Maya, the video card resets the frequencies and operating mode to the minimum and when the load is needed to update the viewport the driver does not have time to boost the video card and as a result the library crashes.

If this did not help you then try these methods:

• Try to download and install other version video driver, but before install you need complete remove previous drivers and other utilities. For this task use Display Driver Uninstaller (DDU) . Also check  and uninstall Vulkan Run Time Libraries. Then install Nvidia Drivers and in custom mode select only drivers and PhysX. Do not install any Ansel and GeForce Experience 

•  Other tips - change the Graphic device timeout in registry editor.

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\GraphicsDrivers

With the GraphicsDrivers key selected, on the Edit menu, click New, and then select the following registry value from the drop-down menu specific to

For 64 bit Windows
a. Select QWORD (64-bit) value.
b. Type TdrDelay as the Name and click Enter.
c. Double-click TdrDelay and add 8 for the Value data and clickOK.

or create *.reg file and paste content below

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\GraphicsDrivers]
"TdrDelay"=hex(b):08,00,00,00,00,00,00,00

SeEXPR Noise Functions

Visual form some noise and random functions. More info see SeExpr doc

Ramps:

Convert curves (guide set) to Yeti Groom (Maya Script)

Simple script to convert any curves to Yeti Groom

To install place this script to C:\Users\__USER__\Documents\maya\scripts\
In Maya to launch script type in MEL command line or place to shelf: convCurv2GuideWind;
Usage: First created from selected curves Set. Select Curve Set than Poly object and type convCurv2GuideWind; or press button on your shelf.

Download:   

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 =)