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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 


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Overview


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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

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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 

 

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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

 

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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

 

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f) Thickness

  • Affects width of fur strands

 

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g) Bend
  • Elasticity of strands

 

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

 

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

 

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

 

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k) Length variance
  • Randomizes lengths

 

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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.

 

 


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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

 

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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

 

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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

 

                        

 


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Demonstration



Time to see it work!

 

                         

 


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Activity


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

 


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Additional resources


Find more training resources listed below: