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Make objects appear more smoothly and reliably.

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david 2002-07-18 19:16:47 +00:00
parent 4ab343569f
commit c814eb3a1e
2 changed files with 38 additions and 9 deletions
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7
src/Objects/newmat.cxx
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@ -181,12 +181,15 @@ FGNewMat::read_properties (const SGPropertyNode * props)
ssgTexturePath((char *)path.dir().c_str());
ssgEntity * model = load_object((char *)path.c_str());
if (model != 0) {
float ranges[] = {0, object_node->getDoubleValue("range-m", 2000)};
object.model = new ssgRangeSelector;
((ssgRangeSelector *)object.model)->setRanges(ranges, 2);
if (object_node->getBoolValue("billboard", false)) {
ssgCutout * cutout = new ssgCutout(false);
cutout->addKid(model);
object.model = cutout;
((ssgBranch *)object.model)->addKid(cutout);
} else {
object.model = model;
((ssgBranch *)object.model)->addKid(model);
}
object.model->ref();
object.coverage = object_node->getDoubleValue("coverage", 100000);

40
src/Objects/obj.cxx
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@ -502,6 +502,29 @@ DummyBSphereEntity::get_entity ()
}
/**
* Calculate the bounding radius of a triangle from its center.
*
* @param center The triangle center.
* @param p1 The first point in the triangle.
* @param p2 The second point in the triangle.
* @param p3 The third point in the triangle.
* @return The greatest distance any point lies from the center.
*/
static float
get_bounding_radius (sgVec3 center, float *p1, float *p2, float *p3)
{
float result = sgDistanceVec3(center, p1);
float length = sgDistanceVec3(center, p2);
if (length > result)
result = length;
length = sgDistanceVec3(center, p3);
if (length > result)
result = length;
return result;
}
/**
* Set up a triangle for randomly-placed objects.
*
@ -526,6 +549,9 @@ setup_triangle (float * p1, float * p2, float * p3,
(p1[1] + p2[1] + p3[1]) / 3.0,
(p1[2] + p2[2] + p3[2]) / 3.0);
// maximum radius of an object from center.
double bounding_radius = get_bounding_radius(center, p1, p2, p3);
// Set up a transformation to the center
// point, so that everything else can
// be specified relative to it.
@ -535,17 +561,17 @@ setup_triangle (float * p1, float * p2, float * p3,
location->setTransform(TRANS);
branch->addKid(location);
// Calculate the triangle area.
double area = sgTriArea(p1, p2, p3);
// Iterate through all the object types.
int num_objects = mat->get_object_count();
for (int i = 0; i < num_objects; i++) {
// Set up the range selector. Note that
// we provide only two ranges, so the
// upper limit will be infinity.
float ranges[] = {0, mat->get_object_lod(i), 9999999};
// Set up the range selector for the entire
// triangle; note that we use the object
// range plus the bounding radius here, to
// allow for objects far from the center.
float ranges[] = {0,
mat->get_object_lod(i) + bounding_radius,
500000};
ssgRangeSelector * lod = new ssgRangeSelector;
lod->setRanges(ranges, 3);
location->addKid(lod);