This is a tool for performing dioptric (refractive, lens-based) anamorphoses. This means that it is able to distort an image such that it can only be seen through a particular lens.
Start with:
- a 3D model of a lens for which you would like to compute the corresponding anamorphosis
- the position of a viewer's eye
- the position of the 'target' (the monitor or projection surface)
In Unity:
In real life:
Live Mode: if checked, recalculates the anamorphosis every frame
Show Rays: if checked, shows debugging lines in the scene view
Show Grid Markers: if checked, shows debugging grid points for the virtual image and distorted image
Grid Marker Size: size of grid markers (if Show Grid Markers is checked)
Mesh Dist Threshold: if the refracted mesh is folded, some parts of the mesh will overlap others, obscuring the desired image. This setting prevents these issues by setting a maximum distance threshold between any two triangle indices on the mesh. Any triangles with points at a greater value than this threshold will be thrown out. Play with this setting (in Live Mode) until the refracted image looks good.
Indices of Refraction: N1 is index of refraction of air (should be 1). Adjust N2 to match the index of refraction of your lens material
Positions (in mm): eye, lens, and target are lined up along Z axis
Virtual Image Size (in mm): set these values as large as you can such that the rays still go through the lens
Target Screen Size: set these values to the size of your target screen on which the anamorphic image will be presented
Resolution of Mesh: set these values as high as seems necessary to achieve an accurate anamorphosis. If this is being performed in real-time, lower settings will be necessary
Width of Debugging Lines: set the value of debugging lines in scene view (only if Show Rays is checked)
Offset Percentage: Probably don't touch this...
Second Ray Offset: Adjust this if things are acting up...
This tool is based on the POV-Ray tool by Francesco De Comité found here.