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use the vector math macros from mathlib.h to make the math in

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ClipToSeparators clearer and comment on how --level effects the vis
calculations
This commit is contained in:
Bill Currie 2002-09-24 21:48:47 +00:00
parent 554347b97c
commit 324172414a
1 changed files with 15 additions and 11 deletions
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26
tools/qfvis/source/flow.c
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@ -106,23 +106,16 @@ ClipToSeparators (winding_t *source, winding_t *pass, winding_t *target,
for (j = 0; j < pass->numpoints; j++) {
VectorSubtract (pass->points[j], source->points[i], v2);
plane.normal[0] = v1[1] * v2[2] - v1[2] * v2[1];
plane.normal[1] = v1[2] * v2[0] - v1[0] * v2[2];
plane.normal[2] = v1[0] * v2[1] - v1[1] * v2[0];
CrossProduct (v1, v2, plane.normal);
length = DotProduct (plane.normal, plane.normal);
// if points don't make a valid plane, skip it
length = plane.normal[0] * plane.normal[0] +
plane.normal[1] * plane.normal[1] +
plane.normal[2] * plane.normal[2];
if (length < ON_EPSILON)
continue;
length = 1 / sqrt (length);
plane.normal[0] *= length;
plane.normal[1] *= length;
plane.normal[2] *= length;
VectorScale (plane.normal, length, plane.normal);
plane.dist = DotProduct (pass->points[j], plane.normal);
@ -296,6 +289,9 @@ RecursiveLeafFlow (int leafnum, threaddata_t *thread, pstack_t *prevstack)
c_portaltest++;
if (options.level > 0) {
// clip target to the image that would be formed by a laser
// pointing from the edges of source passing though the corners of
// pass
target = ClipToSeparators (source, prevstack->pass, target, false);
if (!target) {
FreeWinding (source);
@ -304,6 +300,12 @@ RecursiveLeafFlow (int leafnum, threaddata_t *thread, pstack_t *prevstack)
}
if (options.level > 1) {
// now pass the laser along the edges of pass from the corners of
// source. the resulting image will have a smaller aree. The
// resulting shape will be the light image produced by a backlit
// source shining past pass. eg, if source and pass are equilateral
// triangles rotated 60 (or 180) degrees relative to each other,
// parallel and in line, target will wind up being a hexagon.
target = ClipToSeparators (prevstack->pass, source, target, true);
if (!target) {
FreeWinding (source);
@ -311,6 +313,8 @@ RecursiveLeafFlow (int leafnum, threaddata_t *thread, pstack_t *prevstack)
}
}
// now do the same as for levels 1 and 2, but trimming source using
// the trimmed target
if (options.level > 2) {
source = ClipToSeparators (target, prevstack->pass, source, false);
if (!source) {