From f4b2959ea48682a3fb59d23cfdfd40fbce44d3ae Mon Sep 17 00:00:00 2001
From: slevy <slevy>
Date: Sat, 17 Feb 2001 17:44:05 +0000
Subject: [PATCH] For polygons, rotate circle of vertices by 1/2 step. Then,
for "polysides 4" and "txscale .707", the vertices coincide with the corners
of the 0..1 texture.
---
src/partibrains.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/src/partibrains.c b/src/partibrains.c
index 2dd9947..66b3a80 100644
--- a/src/partibrains.c
+++ b/src/partibrains.c
@@ -1,6 +1,11 @@
static char local_id[] = "$Id$";
/*
* $Log$
+ * Revision 1.22 2001/02/17 17:44:05 slevy
+ * For polygons, rotate circle of vertices by 1/2 step.
+ * Then, for "polysides 4" and "txscale .707",
+ * the vertices coincide with the corners of the 0..1 texture.
+ *
* Revision 1.21 2001/02/17 05:39:45 slevy
* Allow (in data language) "object gN=NAME".
*
@@ -1454,7 +1459,7 @@ void sortedpolys( struct stuff *st, struct specklist *slhead, Matrix *Tc2wp, flo
/* Build prototype fan -- unit disk in screen plane */
for(i = 0; i < nfan; i++) {
- float theta = 2*M_PI*i/nfan;
+ float theta = 2*M_PI*(i+.5f)/nfan;
xyfan[i][0] = cos(theta);
xyfan[i][1] = sin(theta);
vcomb( &sfan[i], xyfan[i][0] / scl, (Point *)&Tc2w.m[0*4+0],
@@ -1654,7 +1659,7 @@ void drawspecks( struct stuff *st )
if(st->npolygon > MAXXYFAN) st->npolygon = MAXXYFAN;
nxyfan = st->npolygon;
for(i = 0; i < nxyfan; i++) {
- float th = i*2*M_PI / nxyfan;
+ float th = (i+.5f)*2*M_PI / nxyfan;
xyfan[i][0] = cos(th);
xyfan[i][1] = sin(th);
}
--
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