This is RenderMan 21 Documentation you are viewing. The Rmanwiki home page will redirect you to the current documentation.

Page tree

You are viewing an old version of this page. View the current version.

Compare with Current View Page History

« Previous Version 14 Current »

Contents

PxrDirt renders local geometric occlusion. This is useful for applying shading effects to nooks and crevices.

A traditional ambient occlusion effect can be accomplished by setting the occluded color to black and unoccluded color to white.

Parameters

Occluded and Unoccluded

Resulting colors for occluded and unoccluded shading.

Error rendering macro 'carousel-slider-macro'

query parameter is required.

Num Samples

Controls the number of occlusion samples per camera hit point. More samples reduces can the noise at the cost of increased render time.

Error rendering macro 'carousel-slider-macro'

query parameter is required.

Sample Distribution

Possible values are uniform and cosine (Lambertian).

Error rendering macro 'carousel-slider-macro'

query parameter is required.

Cosine Spread

Sample spread of rays when using cosine distribution. A value of 1.0 gives a perfect Lambertian distribution.

Error rendering macro 'carousel-slider-macro'

query parameter is required.

Falloff

Falloff values greater than zero create a softer look. Values less than zero give a hard edge when combined with max distance.

Error rendering macro 'carousel-slider-macro'

query parameter is required.

Max Distance

The max distance at which objects may occlude. Zero is infinite (all objects occlude).

Error rendering macro 'carousel-slider-macro'

query parameter is required.

Direction

Trace rays in the direction of the surface normal (outside), inverse to the normal (inside), or in both directions.

Error rendering macro 'carousel-slider-macro'

query parameter is required.

Bias Normal

Add a directional bias to the normal vector. Values must be specified in world space.

Error rendering macro 'carousel-slider-macro'

query parameter is required.