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.\" RCSid "$Id" |
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.\" RCSid "$Id$" |
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.TH OCONV 1 8/15/95 RADIANCE |
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.SH NAME |
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oconv - create an octree from a RADIANCE scene description |
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Larger numbers result in quicker octree generation, |
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but potentially slower rendering. |
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Smaller values may or may not produce faster renderings, |
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since the default number (5) is close to optimal for most scenes. |
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since the default number (6) is close to optimal for most scenes. |
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.PP |
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The |
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.I \-r |
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This should be greater than or equal to the ratio of the largest |
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and smallest dimensions in the scene (ie. surface size or distance between |
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surfaces). |
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The default is 8192. |
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The default is 16384. |
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.PP |
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The |
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.I \-f |
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between machines. |
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The only limitation is that machines with radically different integer |
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sizes will not work together. |
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For the best results, the -f option should be used if an octree is |
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For the best results, the \-f option should be used if an octree is |
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to be used in different environments. |
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.SH DIAGNOSTICS |
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There are four basic error types reported by oconv: |
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.IP "Set overflow in addobject (id)" |
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This error occurs when too many surfaces are close together in a |
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scene. |
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Sometimes a dense scene can be accomodated by increasing |
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the maximum resolution (by powers of two) using the |
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.I \-r |
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option, but usually this error indicates something is wrong. |
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Either too many surfaces are lying right on top of each other, |
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or the bounding cube is inflated from an oversized object |
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or an improper |
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.I \-b |
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specification. |
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If hundreds of triangles come together at a common vertex, it may |
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not be possible to create an octree from the object. |
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This happens most often when inane CAD systems create spheres using |
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a polar tessellation. |
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Chances are, the surface "id" is near one of those causing the problem. |
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.IP "Hash table overflow in fullnode" |
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This error is caused by too many surfaces. |
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To add book1, book2 and a |
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transformed book3 to the octree ``scene.oct'': |
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.IP "" .2i |
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oconv -i scene.oct book1 book2 '\\!xform -rz 30 book3' > newscene.oct |
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oconv \-i scene.oct book1 book2 '\\!xform \-rz 30 book3' > newscene.oct |
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.SH AUTHOR |
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Greg Ward |
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.SH NOTES |
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.I rad(1) |
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can be used to automate octree creation and maintenance. |
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.SH "SEE ALSO" |
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getbbox(1), getinfo(1), make(1), rad(1), |
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rpict(1), rview(1), rtrace(1), xform(1) |
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getbbox(1), getinfo(1), make(1), obj2mesh(1), rad(1), |
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rpict(1), rvu(1), rtrace(1), xform(1) |
