Introduction


 

  • This lesson will take you through setting up grass with V-Ray
  • Information centers around the basic VRayFur parameters
  • The lesson topic is approximately 30 minutes in length
  • Lesson covers all 3 Learning Cycles for the Lesson Topic – Lecture, Demonstration, and Activity

 


Contents


Overview
Available Materials
Lecture
Demonstration
Activity                                 
Additional resources 


Overview


Goal - Develop the look for the grass around the stump. Use various fur parameters to create different looks

Objective – We will use several parameters to set up and alter fur in a scene         

Outcome – You will understand how to work with the fur parameters to create variations in grass

 


 


Available materials


To set up the lesson follow the links below and download all available materials.

Lesson plan download
Presentation (Lecture) download
Demonstration tutorial download                               

Scenes & Assets download 

 

Lecture



1. Terminology

Here’s some terms to be aware of when thinking about fur:

  • Knots
    • Segments for deforming geometry
  • Variance
    • Provides random variations of parameters

 

 

2. V-Ray Fur

a) Fur Overview

  • Add fur node to an object via V-Ray Fur button in V-Ray Shelf, or in the Maya menu choose Create > V-Ray > V-Ray Fur
  • Adjust attributes for fur node
  • Use maps to adjust attributes
  • Assign VRay Hair Mtl to the fur object

 

 


b) Parameters that affect fur
  • Length, Thickness
  • Gravity, Bend, Knots
  • Taper
  • Length variance
  • Distribution

 

 


c) V-Ray Fur button
  • Creates a fur node for selected object
  • Parameters for fur are set within the node

 

 



 

 

d) Rendering of fur 
  • Make sure that the Hair/PaintFX/Fur checkbox is enabled in Render Settings>Overrides>Geometry

 

 


e) Length
  • Sets length of fur strands

 

 



 


f) Thickness

  • Affects width of fur strands

 

 



 


g) Bend
  • Elasticity of strands

 

 



 


h) Gravity
  • Degree of bend toward the –Z axis

 

 



 


i) Knots
  • Number of segments along each strand
  • Higher values make smoother bends

 

 



 

 

j) Taper
  • Tapers all strands
  • Increasing Taper makes strands wider at base, thinner at tip

 

 



 

 

k) Length variance
  • Randomizes lengths

 

 



 

 

l) Distribution
  • Determines how strands are scattered across the surface
  • Per area or Per face

 

 

 


m) Textures
  • Many fur parameters can be set by textures
  • Here we are seeing a Normals map affecting the direction of the grass blades through the Bend Direction texture parameter.

 

 


 



 


n) VRay Fur Sampler node
  • Provides additional attributes for hair and fur control and shading
  • Here, it is used to place a ramp texture color along the length of the fur strand

 

 



 

 

o) VrayHairMtl
  • Material especially for hair and fur
  • Reflection and translucency mimic real-life hair and fur

 

 

 


p) VrayHairMtl parameters

  • Primary specular - light reflected off the outer surface of a strand
  • Primary amount – multiplier for specular color
  • Transmission – overall hair color

 

 



 

 

Conclusion



 

a) Length, Length variance, Thickness
  • Dimensions of strands
b) Gravity, Bend, Knots
  • Bending of strands
c) Taper
  • Tapers strands from base to tip
d) Distribution
  • How strands are spread across surface
e) Vray Mtl Hair
  • Material especially for hair and fur

 

                        

 


Demonstration



Time to see it work!

Watch while I demonstrate how to set up fur.

 

                         

 


Activity



Time to do it yourself!

Use the provided scene file to set up and adjust fur.
We have also provided a final scene for your reference.

 

 

Dialing in the right values

  • Length – 3
  • Knots – 12
  • Bend – 0.75
  • Length variance – 0.75
  • Distribution – Per face           
  • Per face – 10

 


Additional resources


Find more training resources listed below: