Ray tracing

Reflection, transmission, and occlusion-based shadow relations are depicted.

Visual traits

• Reflected light
• Transmitted light
• Occlusion shadows

Expected changes

• Surroundings are more likely to appear in reflective surfaces
• Shadows in occluded areas are more likely to be visible

Definition

It traces rays through the camera and scene to render light effects including occlusion, reflection, and transmission. It differs from physically based material definition and real-time operation.

In more detail

It specifies a method for depicting reflective surfaces, transparent objects, and shadow relationships. Subject, composition, and medium remain separately selectable.

Includes

• Reflection, transmission, and shadow calculated by tracing rays

Excludes

• A particular material type
• A guarantee of real-time performance

What this does not imply

• A photorealistic finish
• A particular material
• Fast rendering

Variability

Results vary with lights, materials, and sampling settings.

Usage

• Trace light paths for reflection and shadow
• Specify subject and materials separately

Distinguish similar expressions

• Use physically based rendering when only material-light behavior is intended

Typical uses

• Depict reflection in mirror-like or glass surfaces

Possible failure modes

• Reflection or shadows are simplified
• Noise is conspicuous