A choice for what shape the bokeh should be: Circular, Polygonal (see Number of sides), or Texture Map (see Bokeh texture map).

When Bokeh shape is “Texture map”, this is the path to the texture to use. The texture should contain a bright bokeh shape on a black background.

(The shader samples the texture based on its intensity using importance_remap, shaping the bokeh to the bright parts of the texture).

When Bokeh shape is “Polygonal”, this is the number of sides the bokeh shape has. This value must be greater than 3.

Rotate the bokeh shape by this number of degrees.

This is a value from -1.0 to 1.0 which controls the aspect ratio of the bokeh shape. Set this to 0 to get square (equal height and width) shapes. Negative fractions make the bokeh shape narrower than it is tall. Positive fractions make the bokeh shape shorter than it is wide.

A texture map to control anisotropy (see the Anisotropy parameter above) for each pixel. In the texture image, black represents -1.0 and white represents 1.0.

Change the projection type of the lense.

Perspective creates a default view of the world in front of the camera. This type can capture the depth of different objects. Orthographic creates a view of the world in front of the camera. This type can`t capture the depth of the different objects. Polar creates a 3-dimensional panoramic view around the camera. You can use the result in a dome-shaped world, for example a sky. Cylindrical creates a 3-dimensional panoramic view similar to the Polar view. Here the shape, that is used to enclose the camera, is a cylinder instead of a sphere. Polar Stereographic projection is used if preserving the shape of small object on image plane is required. Polar Equidistant projection is used if preserving angular sizes of object on image plane is required. Polar Equisolid projection is used if preserving constant ration of solid angles in object and image spaces is required. Polar Orthographic projection is used if evenness of illumination through the entire image plane is required.

A type of curvature to distort the lens with: “None”, “Quadratic”, “Cubic”, or “Texture Map”.

When Curvature type is “Texture map”, this is a path to the texture map. Values in the texture image represent the unit “height” of the lens (distance from flat) at a given position across the face of the lens. Black represents -1.0 and white represents 1.0.

When Curvature type is not “None”, this is the amount of curvature to apply, from -1.0 to 1.0.

The amount of chromatic aberration to add to the lens.

This value plus one represents the index of refraction applied to blue light. The shader then linearly maps this value down to an index of refraction of 1.0 for red light. For example, a value of 0.2 means the index of refraction is 1.2 for blue light and 1.0 for red light, with a linear gradient in between.

For more control over the mapping use the Aberration ramp.

This ramp controls the mapping of aberrations between blue and red light. The left edge of the ramp represents blue light and the right edge represents red light. The vertical axis represents the index of refraction and goes from 1.0 at the bottom to 1.0 + the value of Chromatic Aberration at the top.

Adds a color tint to the output. You can use numbers greater than 1.0 to (unrealistically) brighten the image.

Effectively multiplies this texture map over the output image.

An exponential scale for the brightness of the image.

A linear scale for the brightness of the image.

An amount to darken the image around the edges. Because this is physically based, it is relative to the camera’s field of view. Alternatively, you can use the Tint texture map to get full control over darkening parts of the image.

The number of degrees to tilt the plane of focus by in the X direction (around the camera’s Y axis).

The number of degrees to tilt the plane of focus by in the Y direction (around the camera’s X axis).

The distance (in Houdini world units) to shift the lens in the X direction.

The distance (in Houdini world units) to shift the lens in the Y direction.

The path to a texture map that specifies the f-stop value at each pixel. In the texture image, black represents F-stop near and white represents F-stop far.

The lower bound of the F-stop texture map.

The upper bound of the F-stop texture map.

The path to a texture map that specifies the focus distance at each pixel. In the texture image, black represents Focus near and white represents Focus far.

The lower bound of the Focus Texture Map.

The upper bound of the Focus Texture Map.

Turn this on to use an the OpenCV defined intrinsic camera parameters for lens distortion.

Refer to OpenCV documentation for more details on each of the constants in the intrinsic camera parameters.

The k₁ radial distortion constant in the intrinsic camera parameters defined by OpenCV.

Positive values will produce a barrel distortion, and negative values will produce a pincushion distortion.

The k₂ radial distortion constant in the intrinsic camera parameters defined by OpenCV.

Positive values will produce a barrel distortion, and negative values will produce a pincushion distortion.

The k₃ radial distortion constant in the intrinsic camera parameters defined by OpenCV.

Positive values will produce a barrel distortion, and negative values will produce a pincushion distortion.

The k₄ radial distortion constant in the intrinsic camera parameters defined by OpenCV.

Negative values will produce a barrel distortion, and positive values will produce a pincushion distortion.

The k₅ radial distortion constant in the intrinsic camera parameters defined by OpenCV.

Negative values will produce a barrel distortion, and positive values will produce a pincushion distortion.

The k₆ radial distortion constant in the intrinsic camera parameters defined by OpenCV.

Negative values will produce a barrel distortion, and positive values will produce a pincushion distortion.

The p₁ tangential distortion constant in the intrinsic camera parameters defined by OpenCV.

Positive values will give the effect that the top of the image plane is farther away than the bottom, and negative values will do the opposite.

The p₂ tangential distortion constant in the intrinsic camera parameters defined by OpenCV.

Positive values will give the effect that the right side of the image plane is farther away than the left side, and negative values will do the opposite.

A choice for how to simulate rolling shutter: “None”, “Bottom First”, “Top First”, “Left First”, “Right First”, or “Custom” (see Time offset curve below).

When Rolling shutter is “Custom”, the direction of the shutter movement, in degrees. A value of 0 represents straight up (positive Y in camera space).

When Rolling shutter is “Custom”, this ramp to control the progression of the shutter across the image. See understanding time offset and scale above. The horizontal axis represents shutter time, the vertical axis represents shutter progress, where the bottom is the start position and the top is the end position. So, the default ramp (a line from bottom left to top right) represents a linear progression across the image.

Path to a texture map file to control the time offset. See understanding time offset and scale above.

A base scale on the shutter time. Basically, this affects how blurry the image is, however see understanding time offset and scale above for more information. For rolling shutter effects time scale must be quite small, otherwise the rolling shutter will not be visible.

Path to a texture map file to control the time offset. See understanding time offset and scale above.

Turn this on to get custom control over the amount of light allowed into the camera aperture across the shutter time.

When Use shutter ramp is on, the ramp represents the weighting of a time sample based on it’s position in the shutter period. In terms of a camera, this ramp represents how much light gets through to the sensor (vertical axis) at a given moment across the the shutter time (horizontal axis). The default distribution is uniform.