Standard Surface
The standard surface object is very much like a standard surface in sequential OpticStudio. Standard surfaces include planes, spheres, conic aspheres, and hyperhemispheric spheres and aspheres.
The standard surface requires 4 parameters:
| Parameter # | Description | Face Name | Face # |
| 1 | The radius of curvature. Use zero for infinity (flat). | All Faces | 0 |
| 2 | The conic constant. | All Faces | 0 |
| 3 | The clear semi-diameter to the maximum clear aperture. Use a negative value to yield the hyperhemispheric sag point. | All Faces | 0 |
| 4 | The clear semi-diameter to the minimum clear aperture. This value must be positive. If greater than zero, this value creates a "hole" in the surface. | All Faces | 0 |
The surface is rotationally symmetric about the local z axis.
If the radius is negative, then the surface is concave towards the negative z axis. If the radius is positive, the surface is concave towards the positive z axis.
If the clear semi-diameter is negative, then the surface will become hyper-hemispheric, with the radial aperture of the open end equal to the absolute value of the clear semi-diameter.
Surfaces may reflect or absorb rays.
The reference point is the center of the surface. Face Numbers: All faces Face 0. This object supports user defined apertures, see "User defined apertures" .
For a similar surface shape with more complex aperture shapes supported, see " Aspheric Surface 2 " .
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