BASIC RENDERING TECHNIQUES

Material obtained from Summer workshop in Guildford County, July, 2014Unit 6

RENDERING AND SHADING TECHNIQUES

Rendering produces a finished image. The closer the rendering is to

create a natural scene, the more complex it is, and the longer it takes to render the scene.

Rendering the scene to a file may include such things as the background, output size, compression, file type, and output path.

Rendering previews are small and quick to check your scene prior to doing a full render.

TEXTURE MAPPING

Surfaces may have single colors or they may have multiple color patterns, which are commonly referred to as textures. For example: wood has a

characteristic appearance because of its varying color patterns.

Even materials like metals which seen to be one color, when closely examined, reveal varying shades and colors mixed in random patterns.

TEXTURE MAPPING

The term texture in 3D computer graphics refers to image patterns rather than the “feel” of materials.

The most basic type of texture is a 2D picture (often saved as a .jpeg, .bmp, or .tga file), which is applied to an object.

TEXTURE MAPPING

Opacity maps control whether a material is opaque, transparent, or translucent.

Adding textures to the object is an extremely important part of making objects look realistic.

TEXTURE MAPPING

Textures may be acquired in different ways. Most 3D

programs come with libraries where you can select various materials and patterns.

UV SPACE

UV mapping is a way of trying to solve the distortion problems that occur when applying image maps (textures) to complex surfaces.

Many 3D graphic programs allow texture image scaling and placement controls.

UV SPACE

U represents the horizontal component of an image. It corresponds to the X axis dimension in 2D coordinate space.

V represents the vertical component of an image. It corresponds to the Y axis dimension in 2D coordinate space.

W represents the z axis or depth in 3D coordinate space.

UV SPACE

Tiling allows pattern to be repeated, much like tiles on a floor.

BUMP MAPPING

Bump maps simulate the roughness of surfaces even though the surfaces are perfectly flat.

Bump maps make an object appear to have a bumpy or irregular surface. This is possible because of higher areas are light and lower areas are dark.

LIGHTING

3D programs have some type of default lighting, which can be changed to create a more realistic appearance.

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