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.\" RCSid "$Id: glrad.1,v 1.3 2003/12/09 15:59:06 greg Exp $" |
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.TH GLRAD 1 6/10/98 RADIANCE |
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.SH NAME |
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glrad - render a RADIANCE scene using OpenGL |
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.SH SYNOPSIS |
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.B glrad |
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[ |
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.B \-w |
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][ |
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.B \-b |
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][ |
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.B \-s |
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][ |
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.B \-S |
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][ |
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.B "\-v view" |
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] |
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.B rfile |
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[ |
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.B "VAR\=value .." |
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] |
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.SH DESCRIPTION |
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.I Glrad |
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renders a Radiance scene description in OpenGL. |
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Its syntax and behavior is similar to |
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.I rad(1) |
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with the |
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.I \-o |
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option, where the output device is assumed to be an X11 server |
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with GLX extensions. |
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.PP |
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The |
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.I \-w |
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option turns off warnings. |
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The |
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.I \-s |
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option tells |
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.I glrad |
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to run |
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.I rad |
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silently, not echoing |
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.I oconv(1) |
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command. |
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The |
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.I \-b |
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option turns off back face visibility (i.e., enables back face culling). |
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This is equivalent to the |
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.I \-bv |
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option of |
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.I rpict(1) |
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and |
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.I rvu(1). |
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The |
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.I \-S |
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option turns on full-screen stereo for displays that support it. |
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(Be sure to run |
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.I /usr/gfx/setmon(1) |
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or its equivalent to set STR_TOP or STR_BOT, first.)\0 |
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The |
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.I \-v |
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option may be used to specify a starting view, either by symbolic name |
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as entered in the |
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.I view |
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assignments in |
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.I rfile, |
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or by a complete view specification, enclosed in quotes. |
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If no view is specified, then the first standard view from |
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.I rfile |
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is used to start. |
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.PP |
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Variables permitted in |
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.I rfile |
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are described in the |
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.I rad |
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manual page. |
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Additional or overriding assignments may be given on the command line |
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following |
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.I rfile. |
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.PP |
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The view is controlled via the mouse and simple one-character commands, |
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listed below: |
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.TP 10n |
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.BR "(mouse)" |
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Modify the current view. |
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The mouse is used to control the current view in the following ways: |
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.sp |
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.nf |
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CONTROL MOUSE ACTION |
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(none) left Move forward towards cursor position |
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(none) right Move backward away from cursor position |
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(none) middle Rotate in place (usually safe) |
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shift left Orbit left around cursor position |
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shift right Orbit right around cursor position |
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shift middle Orbit skyward |
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cntl middle Orbit earthward |
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.fi |
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.sp |
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For all movements but rotating in place, the cursor must be placed over some |
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bit of visible geometry, otherwise the program has no reference point from |
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which to work. |
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It is best to just experiment with these controls until you learn to fly |
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safely in your model. |
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And if you run into trouble, the 'l' command is very useful. |
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(See below.)\0 |
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.TP |
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.BR '+' |
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Zoom in on the current cursor position. |
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(Beware of repeating keys that go faster than the display updates.) |
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.TP |
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.BR '-' |
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Zoom out from the current cursor position. |
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.TP |
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.BR 'l' |
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Return to the last saved view. |
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Each time a new command changes the current view, the last view |
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is saved, and may be recalled with this command. |
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Multiple uses of the same command (e.g., rotation, zoom) will |
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save only the view before the first such command. |
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This way, it is easy to get back to where you were before a sequence |
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of view changes. |
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.TP |
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.BR 'h' |
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Fix the head height. |
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All mouse-controlled view motions will be adjusted so that the head height |
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does not change (where vertical is determined by the current |
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view up vector). |
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.TP |
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.BR 'H' |
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Release the head height, allowing it to change again during mouse-controlled |
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movements. |
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.TP |
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.BR 'v' |
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Print the current view parameters to the standard output. |
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This is useful for finding out where you are, or for saving specific |
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views in a keyframe file for animations or returning to later. |
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.TP |
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.BR 'V' |
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Append the current view to the original |
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.I rfile. |
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This view will be unnamed, but can be referred to by number or the |
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user may add a name later with a text editor. |
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The current view number becomes the last standard view. |
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(See the 'n' and 'p' commands, below.) |
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.TP |
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.BR 'n' |
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Go to the next standard view stored in |
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.I rfile. |
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If the last view is currently displayed, then cycle to the first one. |
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.TP |
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.BR 'p' |
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Go to the previous standard view stored in |
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.I rfile. |
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If the first view is currently displayed, then cycle to the last one. |
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.TP |
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.BR 'q' |
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Quit |
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.I glrad. |
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This is the normal way to exit the program. |
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.SH AUTHOR |
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Greg Ward Larson |
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.SH BUGS |
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It would be nice if |
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.I glrad |
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set the appropriate video format for stereo viewing automatically, |
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but the process is different on different systems and there is no |
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single, sure-fire way to do it for all systems. |
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On systems that do not support stereo extensions, the program |
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may be compiled with the -DNOSTEREO option, which will avoid |
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undefined symbol errors. |
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.SH "SEE ALSO" |
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chmod(1), getinfo(1), ls(1), objview(1), oconv(1), ps(1), rad(1), |
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ranimate(1), rhcopy(1), rholo(1), rpict(1), rtrace(1), rvu(1), setmon(1) |
