Houdini 22.0 Nodes Copernicus nodes

Sphere Sample Copernicus node

Samples a layer onto a sphere.

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Since 22.0

This node samples a source layer as a latitude-longitude map on a sphere. The output uses the size_ref input for its resolution and camera/view metadata, then looks up the source layer from the spherical direction or sphere intersection at each output pixel.

When Celestial Sphere is on, the source is sampled as a sphere at infinity, similar to an environment map. When it is off, the node samples a transformable unit sphere and outputs a mask for pixels that hit the sphere.

Parameters

Signature

The layer type that the source accepts.

See Signatures for more information.

Filter

The method used to sample the source layer.

Point

Use the nearest pixel with no interpolation.

Bilinear

Linearly interpolate between neighboring pixels.

Box

Average pixels within a box filter.

Bartlett

Use a triangular filter.

Catmull-Rom

Use a sharper cubic filter.

Mitchell

Use a smooth cubic filter with reduced ringing.

B-spline

Use a smooth cubic B-spline filter.

Transform Order

The order in which the transform components are applied when Celestial Sphere is off.

Scale Rot Trans

Apply scale, then rotation, then translation.

Scale Trans Rot

Apply scale, then translation, then rotation.

Rot Scale Trans

Apply rotation, then scale, then translation.

Rot Trans Scale

Apply rotation, then translation, then scale.

Trans Scale Rot

Apply translation, then scale, then rotation.

Trans Rot Scale

Apply translation, then rotation, then scale.

Rotation Order

The order in which rotations around the X, Y, and Z axes are applied.

Rx Ry Rz

Rotate around X, then Y, then Z.

Rx Rz Ry

Rotate around X, then Z, then Y.

Ry Rx Rz

Rotate around Y, then X, then Z.

Ry Rz Rx

Rotate around Y, then Z, then X.

Rz Rx Ry

Rotate around Z, then X, then Y.

Rz Ry Rx

Rotate around Z, then Y, then X.

Celestial Sphere

Samples the source as a sphere at infinity. When on, only Rotate affects the sampled direction, and the mask is 1 everywhere.

Projection

The projection used to sample the transformable sphere when Celestial Sphere is off.

Perspective

Cast rays from the camera through the output pixels.

Orthographic

Cast parallel rays using the view direction.

Translate

Moves the sampled sphere in 3D space when Celestial Sphere is off.

Rotate

Rotates the sampled sphere, in degrees.

Scale

Scales the sampled sphere independently along each axis when Celestial Sphere is off.

Uniform Scale

Uniformly scales the sampled sphere when Celestial Sphere is off.

Inputs

size_ref

A metadata layer that provides the output size and camera/view information used for the sphere sampling.

source

The source layer to sample as a latitude-longitude sphere map.

Outputs

transform

The source layer sampled onto the sphere.

mask

A mono layer that is 1 where the sphere was sampled and 0 where the view did not hit the sphere. For celestial sphere mode, this is 1 everywhere.

See also

Copernicus nodes