From theseas!Princeton.EDU!cek Fri, 25 Mar 94 09:02:04 EET Received: by kriton.UUCP (V1.16/Amiga) id AA00000; Fri, 25 Mar 94 09:02:04 EET Received: by theseas.ntua.gr with UUCP; Thu, 24 Mar 1994 18:30:30 +0200 Received: from eunet.EU.net by pythia.ics.forth.gr via FORTHnet with SMTP; id AA04388 (5.65c/FORTH-ICS-3.0-MHS-7.0); Thu, 24 Mar 1994 17:43:13 +0200 Received: (uunet@localhost) by eunet.EU.net (8.6.8/8.6.8) with UUCP id QAA26081 for ariadne!theseas!kriton!kyrimis; Thu, 24 Mar 1994 16:01:45 +0100 Received: from Princeton.EDU by relay2.UU.NET with SMTP (5.61/UUNET-internet-primary) id AAwipv25343; Thu, 24 Mar 94 09:58:37 -0500 Received: from fs.Princeton.EDU by Princeton.EDU (5.65b/2.108/princeton) id AA18949; Thu, 24 Mar 94 09:55:26 -0500 Received: by cs.Princeton.EDU (4.1/1.105) id AA08991; Thu, 24 Mar 94 09:55:24 EST Received: from lobster.wellfleet.com by cs.Princeton.EDU (4.1/1.105) id AA08927; Thu, 24 Mar 94 09:54:48 EST Received: from pobox.wellfleet (pobox.wellfleet.com) by lobster.wellfleet.com (4.1/SMI-4.1) id AA00321; Thu, 24 Mar 94 09:37:31 EST Received: from nantucket.wellfleet by pobox.wellfleet (4.1/SMI-4.1) id AA14350; Thu, 24 Mar 94 09:48:24 EST Received: from lobster.wellfleet.com by pobox.wellfleet (4.1/SMI-4.1) id AA14333; Thu, 24 Mar 94 09:47:27 EST Received: by lobster.wellfleet.com (4.1/SMI-4.1) id AB00310; Thu, 24 Mar 94 09:36:21 EST Date: Thu, 24 Mar 94 09:36:21 EST Message-Id: <9403241436.AB00310@lobster.wellfleet.com> Sender: mark_podlipec@wellfleet.com Errors-To: rayshade-request@cs.Princeton.EDU Remailed-Date: Thu Mar 24 09:54:54 EST 1994 From: Mailer-Daemon@lobster.wellfleet.com (Mail Delivery Subsystem) To: Subject: Returned mail: Service unavailable ----- Transcript of session follows ----- Connected to YALE.EDU: >>> RCPT To: <<< 554 ... rayshade : unknown person or mailing list 554 ... Service unavailable ----- Unsent message follows ----- Return-Path: Received: from pobox.wellfleet (pobox.wellfleet.com) by lobster.wellfleet.com (4.1/SMI-4.1) id AA00308; Thu, 24 Mar 94 09:36:21 EST Received: from nantucket.wellfleet by pobox.wellfleet (4.1/SMI-4.1) id AA14329; Thu, 24 Mar 94 09:47:15 EST From: podlipec@pobox (Mark Podlipec) Message-Id: <9403241447.AA14329@pobox.wellfleet> Subject: Re: Negative Blobs To: rayshade@cs.yale.edu Date: Thu, 24 Mar 94 9:54:58 EST Cc: mgix@jpn.thomson-di.fr Reply-To: podlipec@wellfleet.com In-Reply-To: <9403240856.AA17856@krainte.jpn.thomson-di.fr>; from "Emmanuel Mogenet" at Mar 3, 94 2:32 pm Organization: Wellfleet Communications Inc. X-Mailer: ELM [version 2.3 PL11] The rayshade enhanced has had negative blobs for a while now. Here's the actual code so that it checks against negative radii and strength's of zero. if ( ( (cur->mvec.c0 > -EPSILON) && (cur->mvec.c0 < EPSILON) ) || (cur->mvec.rs < EPSILON) ) { RLerror(RL_WARN,"Degenerate metaball in blob (sr).\n"); return (Blob *)NULL; }; The enhanced verison also supports multicolored blobs(where each metaball can be a different color). I have also written code that supports 4th and 6th degree blobs(the difference is comparable between 2nd and 3rd degree splines) and 4th degree blobs with a squash vector(pushes the metaball's density so that it's no long radial symmetric about the center), but haven't had time to polish it yet. Mark podlipec@wellfleet.com ---------- Administrivia: rayshade-request@cs.princeton.edu Mailing list: rayshade-users@cs.princeton.edu