RE: Performer 2.0 frustum problem

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Salvador Cabaruvias (sal++at++fbdev1.mdc.com)
Mon, 12 Aug 1996 12:01:48 -0700

whoops... I sent the one I have been monkeying with to see if I can correct the
problem.

Here is the attached performer 1.2 original.

-- 
--------------------------------------------------------------------------------
Salvador Cabaruvias                       |     sal++at++sgidev.mdc.com             |
--------------------------------------------------------------------------------
CSSL                                      |     "Well I be done seen about every  
McDonnell Douglas                         |      thing when I see an elephant 
(310) 593-6719                            |      fly"  --Dumbo--




/*
 * channels.c 
 *  %M% %I% %H%
 * add to the script with a line like this:
 * 
 *  module "setChannels" add, postinit "setChannelsup";
 * 
 * 
 * this will override what's in the setup file
 */


#include <math.h>
#include <Performer/pf.h>
#include <Performer/pr.h>
#include <Performer/prmath.h>
#include "_es.h"


#define leftside_angle 		24.0f
#define rightside_angle 	24.0f


#define topsided9_angle 	24.0f
#define bottomsided9_angle 	12.0f


#define topsided3_angle 	15.0f
#define bottomsided3_angle 	21.0f


void setChannelsd9up(void);
void setChannelsd3up(void);
void setFrontChannel(float topside_angle, float bottomside_angle);
void setLeftChannel(float topside_angle, float bottomside_angle);


static float f_left   =    -0.5;
static float f_right  =     0.5;
static float f_bottom =    -0.5;
static float f_top    =     0.5;
static float f_near   =     2.0;
static float f_far    = 225000.0;


static float l_left   =    -0.5;
static float l_right  =     0.5;
static float l_bottom =    -0.5;
static float l_top    =     0.5;
static float l_near   =     2.0;
static float l_far    = 225000.0;
static pfChannel *FrontChan, *LeftChan;


void
setChannelsd9up(void)  {
   


   setFrontChannel(topsided9_angle, bottomsided9_angle);
   setLeftChannel(topsided9_angle, bottomsided9_angle);
   
}
void
setChannelsd3up(void)  {
   


   setFrontChannel(topsided3_angle, bottomsided3_angle);
   setLeftChannel(topsided3_angle, bottomsided3_angle);
#ifdef _MDCESky
   if(global->esky == NULL) global->esky = pfNewESky();
   pfESkyMode(global->esky, PFES_BUFFER_CLEAR, PFES_SKY_GRND);
   pfESkyAttr(global->esky, PFES_GRND_HT, -3.0f);
   pfChanESky(FrontChan, global->esky);
   pfChanESky(LeftChan, global->esky);
#endif  
}


void
setFrontChannel(float topside_angle, float bottomside_angle)  {
   
   /* assume first channel in list is front channel */
   FrontChan = global->channels->pfchan;
   
   printf("Defining the front window with pfMakePerspFrust\n");
   pfFrustAspect( FrontChan, PFFRUST_CALC_NONE, 0.0f);  /* Needed to workaround a bug */
   pfChanAutoAspect( FrontChan, PFFRUST_CALC_NONE);
   pfFrustNearFar( FrontChan, f_near, f_far);
   pfMakePerspFrust( FrontChan,
		    -f_near * pfTan(leftside_angle), /* left */
		     f_near * pfTan(rightside_angle), /* right */
		    -f_near * pfTan(bottomside_angle), /* bottom */
		     f_near * pfTan(topside_angle) /* top */
		   );
}


void
setLeftChannel(float topside_angle, float bottomside_angle)  {
   
/*   pfVec3 xyz, hpr; */
   
   /* assume second channel in list is next channel */
   LeftChan = global->channels->next->pfchan;
   pfAttachChan(FrontChan, LeftChan);


 
   printf("Defining the left window with pfMakePerspFrust\n");
   pfFrustAspect( LeftChan, PFFRUST_CALC_NONE, 0.0f);  /* Needed to workaround a bug */
   pfChanAutoAspect( LeftChan, PFFRUST_CALC_NONE);
   pfFrustNearFar( LeftChan, l_near, l_far);
   pfMakePerspFrust( LeftChan,
		    -l_near * pfTan(leftside_angle), /* left */
		     l_near * pfTan(rightside_angle), /* right */
		    -l_near * pfTan(bottomside_angle), /* bottom */
		     l_near * pfTan(topside_angle)  /* top */
		   );


#ifdef MDC_OFFSET
   xyz[0]  = 0.;
   xyz[1]  = 0.;
   xyz[2]  = 0.;
   hpr[0]  = 44.;
   hpr[1]  = 0.;
   hpr[2]  = 0.;
   
   pfChanViewOffsets( LeftChan, xyz, hpr);
#endif   
}





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