Lesson Plan Industry Sector
Arts, Media & Entertainment

## Creating 3D Materials

### Lesson Plan Overview / Details

The creation and application of materials provides texture and depth to a 3D scene. Material design can also make modeling of some objects much easier.

### Lesson Time

Introduction
15 Minutes
Setup
40 Minutes
Materials & Mapping
55 Minutes
Independent Practice
55 Minutes

### Objectives and Goals

• Students will be able to create and apply materials to 3D objects.
• Students will have a basic understanding of 3D mapping.

### Activities in this Lesson

• Introduction - Hooks / Set

Using the powerpoint, introduce five of the basic material properties and show how they appear on an object. Tell students to take notes as you go over each.

Material Properties

Color: This channel applies color, textured patterns, or images to the surface.

Bump: This channel provides surface deviations as most objects are not perfectly smooth. Bump requires a texture map or procedural shader of some sort.

Alpha: An alpha channel works similar to a mask in photoshop; black will block the image (making it invisible) and white will reveal the image. Using black and white images on an alpha channel allows you to create holes in objects.

Specular: This channel creates the highlights that appear on surfaces from reflected light. Some highlights are small and bright, like shiny metal, others are larger and duller like paper.

Reflection: This will cause your object to show reflections of other objects on its surface. Adjust the amount of reflection using the Brightness slider.

• Setup - Demo / Modeling

Have students create a series of basic geometric primitives to which the materials will be applied. If this is early in the class, you may want to guide them in the shape, size, and placement, reinforcing previous lessons on positioning objects.

The sample below uses the following:

1. a plane with a grass material
2. a cylinder with green glass material
3. a cylinder with marble material
4. a cylinder with a rebar material
5. a cube with a wire mesh material

• Materials - Demo / Modeling

Create and apply each of the materials to the objects. Discuss the settings as they are adjusted and emphasize the process of mapping each material to each object.

Materials must be “mapped” onto a surface of an object. Think of it as dressing the object with the material. How do you make it best fit the object? Where do the seams go? How many “tiles” of the image do you want repeat on the object?

Once a material has been applied to an object, it needs to be properly mapped to the object. To do this you often need to define the projection, orientation, and the number of tiles of the material.

Projection: Normally based on shape, typical options are cubic, spherical, cylindrical, flat, and UVW mapping.

Orientation:  This is rotated, scaled, and moved as you would an object.

Tiles:  This relates to how the material is repeated on the object.

• Materials [ View Flash ] [ Download ] This is a tutorial showing how the materials are applied in MAXON Cinema 4D.
• Mapping - Guided Practice

Mapping Exercise

Objective: Map a brick material onto a cube object to create a brick wall.

1. Create 3D object
2. Create brick material
3. Apply the material to the object
4. Map the material to the object

Images:
bricks.jpg          bwbricks.jpg

Step 1: Create a 3D primitive cube and resize it into the shape of a brick wall. This can be further adjusted later if necessary.

Step 2: Create a brick material and apply it to the wall object.

Step 3: Set the Projection to Cubic.

Step 4: Adjust the cubic map by position, scale and rotation.

Step 5: Adjust the cubic map using tiles. The brick thickness should be about one third of the length.

Step 6: Adjust the wall object thickness if necessary to create a wall thickness of one brick.

Mapping Materials Requires:

• Manipulating object
• Setting projection