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10.8.3.1 Lens Type Planar

 
Lens sub-section in the Iray section of the camera Attribute Editor
 
 
Lens Type Planar is the default lens type simulating a regular lens while rendering.
 
When Planar is selected you have the choice to select a distortion type for the planar lens:
 
Distortion Type Linear
No lens distortion is applied to the render result.
 
Note:
The default setting for Lens is Lens Type Planar and Distortion Type Linear. This setting is the lens behavior as in the previous version of Iray for Maya.
 
Lens sub-section in the Iray section of the camera Attribute Editor
 
Lens distortion is used to adjust the perfect computer lens in computer graphics to fit real world camera lenses. Finding the correct parameters to do so is a complex process and requires expert knowledge. You can find different websites covering this topic. The exposed attributes are meant for specialists knowing how lens calibration works and how to convert the calibration results in computer graphics.
 
    The described distortion types controls the radial distortion model. The radial distortion models define the relationship between the undistorted radial pixel coordinate ru and the distorted radial pixel coordinate rd.
 
Distortion Type Third Order Radial
Third order radial distortion model: rd = ru · (1.0 - k1 + k1 · ru2)
 
Distortion Type Third Order Inverse Radial
Third order inverse radial distortion model: ru = rd · (1.0 - k1 + k1 · rd2)
 
Distortion Type Fifth Order Radial
Fifth order radial distortion model: rd = ru · (1.0 + k1 · ru2 + k2 · ru4)
 
Distortion Type Fifth Order Inverse Radial
Fifth order inverse radial distortion model: ru = rd · (1.0 + k1 · rd2 + k2 · rd4)
 
Distortion Type Fourth Order Radial
Fourth order radial distortion model: rd = ru · (1.0 - k1 - k2 - k3 + k1 · ru + k2 · ru2 + k3 · ru3)
 
Distortion Type Fourth Order Inverse Radial
Fourth order inverse radial distortion model: ru = rd · (1.0 - k1 - k2 - k3 + k1 · rd + k2 · rd2 + k3 · rd3)
 
Distortion Parameter k1
Controls the parameters k1 in the radial distortion models.
 
Distortion Parameter k2
Controls the parameters k2 in the radial distortion models.
 
Distortion Parameter k3
Controls the parameters k3 in the radial distortion models.
 
Distortion Scale
Controls the relative scale of the lens distortion.