From russo@rudedog.ait.nrl.navy.mil Thu Oct 7 09:55:43 1993 Date: Thu, 7 Oct 93 12:55:37 -0400 From: russo@rudedog.ait.nrl.navy.mil (Kevin Russo) Message-Id: <9310071655.AA13915@rudedog.ait.nrl.navy.mil> To: info-performer@sgi.sgi.com Subject: Stars Status: OR Is it better to implement stars in the night sky (or as seen from Earth orbit) as Geosets of PFGS_POINTS or as pfLightPoint nodes? Kevin Russo Naval Research Lab From jrohlf@tubes Thu Oct 7 10:31:01 1993 Date: Thu, 7 Oct 93 10:30:42 -0700 From: jrohlf@tubes (John Rohlf) Message-Id: <9310071730.AA00545@tubes.asd.sgi.com> To: russo@rudedog.ait.nrl.navy.mil (Kevin Russo), info-performer@sgi.sgi.com Subject: Re: Stars Status: OR >Is it better to implement stars in the night sky (or as seen from >Earth orbit) as Geosets of PFGS_POINTS or as pfLightPoint nodes? pfLightPoints are probably easiest and should be comparable in performance to pfGeoSets. From guest Thu Apr 7 02:19:26 1994 From: Vassilis Seferidis Date: Thu, 7 Apr 94 10:09:29 BST Message-Id: <22144.9404070909@prsun11b.prl.philips.co.uk> To: info-performer@sgi.sgi.com Subject: pfLightPoint use Status: OR Hi all, I want to create several visible light sources using the pfLightPoint related functions. According to the manual pages the following part of my program should create several light points distributed along the z axis. ....... pfLightPoint *lpoint; pfVec3 clr, pos; lpoint = pfNewLPoint(20); /* Define 20 light points */ pfLPointSize(lpoint, 2.0f); /* Define the size for each one */ clr[0]=1.0f; clr[1]=1.0f; clr[2]=1.0f; pfLPointColor(lpoint, clr); /* Define the color of the light sources */ /* Define direction vector */ pfLPointShape(lpoint, PFLP_OMNIDIRECTIONAL, 0.0, 0.0, 0.0); pos[0]=0.0f; pos[1]=0.0f; pos[2]=0.1f; for(i=0; i<20; i++) { pfLPointPos(lpoint, i, pos); /* define the lights position */ pos[2] += 0.1; } ...... The problem with this program is that the light points do not appear in the scene. What am I doing wrong? Do I have to switch the light points on using pfLightOn or something similar like with pfLight sources ? I'd wellcome any help. Vassilis email: ukrsefe@prl.philips.co.uk From guest Fri May 20 09:47:05 1994 From: jrohlf@tubes (John Rohlf) Message-Id: <9305201645.AA01301@tubes.asd.sgi.com> Subject: Re: pfLightPoint use To: guest (Vassilis Seferidis) Date: Thu, 20 May 93 9:45:31 PDT Cc: info-performer@sgi.sgi.com In-Reply-To: <22144.9404070909@prsun11b.prl.philips.co.uk>; from "Vassilis Seferidis" at Apr 7, 94 10:09 am X-Mailer: ELM [version 2.3 PL8] Status: OR > > > Hi all, > > I want to create several visible light sources using the pfLightPoint > related functions. According to the manual pages the following part of > my program should create several light points distributed along the z axis. > > ....... > pfLightPoint *lpoint; > pfVec3 clr, pos; > > lpoint = pfNewLPoint(20); /* Define 20 light points */ > pfLPointSize(lpoint, 2.0f); /* Define the size for each one */ > > clr[0]=1.0f; clr[1]=1.0f; clr[2]=1.0f; > pfLPointColor(lpoint, clr); /* Define the color of the light sources */ > > /* Define direction vector */ > pfLPointShape(lpoint, PFLP_OMNIDIRECTIONAL, 0.0, 0.0, 0.0); > > pos[0]=0.0f; pos[1]=0.0f; pos[2]=0.1f; > for(i=0; i<20; i++) > { > pfLPointPos(lpoint, i, pos); /* define the lights position */ > pos[2] += 0.1; > } > ...... > > The problem with this program is that the light points do not appear in > the scene. What am I doing wrong? > > Do I have to switch the light points on using pfLightOn or something similar > like with pfLight sources ? > > I'd wellcome any help. pfLightPoints ignore lighting (pfLightOn, pfLightSource). It looks like you are using 1.0/1.1 but if you are using 1.2 you need to specify the alpha. If you don't then you're likely to get 0 alpha which will result in fully transparent light points. From guest Thu Feb 3 10:21:28 1994 From: "Craig Phillips" Message-Id: <9402031102.ZM17362@binky.paradigmsim.com> Date: Thu, 3 Feb 1994 11:02:36 -0600 X-Mailer: Z-Mail (3.0B.0 25aug93 MediaMail) To: info-performer@sgi.sgi.com Subject: light points Cc: vick@binky.paradigmsim.com, vega@spiffy.paradigmsim.com Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 Status: OR there is no api for getting the number of lights in a pfLightPoint. I haven't tried pfGetNumChildren, but that doesn't seem like it should work. Also, the lightpoint is created specifing the maximum number of lights. there is nothing in the man page about adding, deleting or turning off a light point. whats the condition that makes a light active or inactive? -- __________________________________________________ Craig Phillips Paradigm Simulation Inc. craig@paradigmsim.com 214-960-2301 __________________________________________________