I am trying to find a way to retreive the dimensions of the bounding box for a given geometry so i can display it if a geometry is clicked.
I have done this using the Collision extension.
I create 3 planes and collide them with the shape.
In the example below, click on the shape and its bounding box is returned.
The box orientation is relative to the world (not the object's local coordinate system). It could be tweeked to be relative to local.
Steve Smith
Aberystwyth
#VRML V2.0 utf8
# first create an object to get the bounds of
DEF object Transform{children[
DEF tch TouchSensor {}
DEF shp Shape {geometry
IndexedFaceSet{
solid FALSE convex TRUE
coord Coordinate{point[-2 -2.5 -2.7 , -2 0 2 , 2.8 3.2 2],}
coordIndex[0,1,2,-1]}
}
]}
# create 3 planes for colliding with the shape
DEF SX Switch {whichChoice -1 choice[
DEF PX Transform{children[
Shape{appearance Appearance{material Material{transparency 0}}
geometry IndexedFaceSet{solid FALSE convex TRUE
coord Coordinate{point[0 -9999 -9999,0 -9999 9999,0 9999 9999,0 9999 -9999]}
coordIndex[0,1,2,3,-1]}
}
]}
]}
DEF SY Switch {whichChoice -1 choice[
DEF PY Transform{translation 0 0 0 children[
Shape{appearance Appearance{material Material{transparency 0}}
geometry IndexedFaceSet{solid FALSE convex TRUE
coord Coordinate{point[-9999 0 -9999, -9999 0 9999, 9999 0 9999, 9999 0 -9999]}
coordIndex[0,1,2,3,-1]}
}
]}
]}
DEF SZ Switch {whichChoice -1 choice[
DEF PZ Transform{translation 0 0 0 children[
Shape{appearance Appearance{material Material{transparency 0}}
geometry IndexedFaceSet{solid FALSE convex TRUE
coord Coordinate{point[-9999 -9999 0,-9999 9999 0,9999 9999 0,9999 -9999 0]}
coordIndex[0,1,2,3,-1]}
}
]}
]}
DEF E Script{
directOutput TRUE
mustEvaluate TRUE
field SFNode object USE object
field SFNode px USE PX
field SFNode sx USE SX
field SFNode py USE PY
field SFNode sy USE SY
field SFNode pz USE PZ
field SFNode sz USE SZ
eventIn SFTime tchTime
url "vrmlscript:
function tchTime(){
print(getBoundingBox(object));
}
function getBoundingBox(ob){
ub=9999;lb=-9999;
res=new SFVec3f();
colid1=new Collidee();
colid2=new Collidee();
colid1.body=ob;
colid2.body=py;
colid1.scenary=colid2;
sx.whichChoice=0;
colid1.position=new SFVec3f(lb,0,0); colid1.moveTo(new SFVec3f(ub,0,0)); pa=colid1.collision.point.x;
colid1.position=new SFVec3f(ub,0,0); colid1.moveTo(new SFVec3f(lb,0,0)); pb=colid1.collision.point.x;
res.x=round3(ub*2+pa-pb);
sx.whichChoice=-1;
sy.whichChoice=0;
colid1.position=new SFVec3f(0,lb,0); colid1.moveTo(new SFVec3f(0,ub,0)); pa=colid1.collision.point.y;
colid1.position=new SFVec3f(0,ub,0); colid1.moveTo(new SFVec3f(0,lb,0)); pb=colid1.collision.point.y;
res.y=round3(ub*2+pa-pb);
sy.whichChoice=-1;
sz.whichChoice=0;
colid1.position=new SFVec3f(0,0,lb); colid1.moveTo(new SFVec3f(0,0,ub)); pa=colid1.collision.point.z;
colid1.position=new SFVec3f(0,0,ub); colid1.moveTo(new SFVec3f(0,0,lb)); pb=colid1.collision.point.z;
res.z=round3(ub*2+pa-pb);
sz.whichChoice=-1;
return res;
}
function round3(a){return Math.round(a*1000)/1000;}
"}
ROUTE tch.touchTime TO E.tchTime
bounding box