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Description
This feature creates a source using random ray positions on a specified surface entity. The direction of the positive surface normal determines the default direction of these rays, which for most surface types will be the initial +Z direction. For a cylinder, the default direction is outward. The ray positions are created on the OpenGL tessellated surface, so the user should be certain that the target surface is fully tessellated before tracing rays. If the target surface is not fully tessellated, the spatial distribution of ray positions will not fully reflect the true geometry of the target surface.
Navigation
This feature can be accessed by selecting Random Surface (random points on a designated surface) as the ray position type on the Positions/Directions tab of a detailed source dialog box.
Controls
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Control
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Inputs / Description
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Defaults
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Type
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Random Surface (random points on a designated surface)
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Grid Plane
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Parameters
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Surf
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Surface on which rays are created. Choose from the list of valid surfaces.
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Rays
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Number of rays distributed randomly over surface using the surface tessellation to determine ray location.
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0
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Direction
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Direction specification of the source. Options are:
Random Lambertian - Rays evenly distributed in direction cosine space
Random Isotropic - Rays evenly distributed in angle space
Surface Normal - Rays directed along surface normal
Use Dir Func - Use the direction specification in the Ray Directions section
NOTE: Random Lambertian, Random Isotropic and Surface Normal settings ignore parameters in the Ray Directions section.
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Random Lambertian
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Offset
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Distance offset along surface normal.
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0
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Iter
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Positions rays exactly on surface rather than using the surface tessellation as a guide.
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Unchecked
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Reverse
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Reverses the ray direction determined by positive surface normal.
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Unchecked
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OK
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Accept settings and close dialog box.
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Cancel
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Discard settings and close dialog box.
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Apply
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Apply settings and close dialog box.
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Help
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Access this Help page.
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Related Topics
Ray Positions - Bitmap
Ray Positions - Grid Plane
Ray Positions - Hexagonal Plane
Ray Positions - Read rays from a file
Ray Positions - Random Plane
Ray Positions - Random String
Ray Positions - Random Volume
Ray Positions - User-defined Rays
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Copyright © Photon Engineering, LLC
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