OSG_BASE_DLLMAPPING bool intersect(const BoxVolume &box1, const BoxVolume &box2) { bool retCode = false; if(box1.isEmpty() == true || box2.isEmpty() == true) { retCode = false; } else if(box1.isInfinite() == true || box2.isInfinite() == true) { retCode = true; } else { retCode = (box1.getMin()[0] <= box2.getMax()[0] && box1.getMax()[0] >= box2.getMin()[0] ) && (box1.getMin()[1] <= box2.getMax()[1] && box1.getMax()[1] >= box2.getMin()[1] ) && (box1.getMin()[2] <= box2.getMax()[2] && box1.getMax()[2] >= box2.getMin()[2] ); } return retCode; }
OSG_BASE_DLLMAPPING void extend(BoxVolume &srcVol, const CylinderVolume &vol) { Pnt3f min, max; if((!srcVol.isValid () && !srcVol.isEmpty()) || srcVol.isInfinite() || srcVol.isStatic () ) { return; } if(!vol.isValid()) return; if(srcVol.isEmpty()) { if(vol.isEmpty()) { return; } else { vol .getBounds(min, max); srcVol.setBounds(min, max); return; } } else if(vol.isEmpty()) { return; } vol.getBounds(min, max); srcVol.setBounds(osgMin(min.x(), srcVol.getMin().x()), osgMin(min.y(), srcVol.getMin().y()), osgMin(min.z(), srcVol.getMin().z()), osgMax(max.x(), srcVol.getMax().x()), osgMax(max.y(), srcVol.getMax().y()), osgMax(max.z(), srcVol.getMax().z())); if(vol.isInfinite()) srcVol.setInfinite(true); return; }
OSG_BASE_DLLMAPPING void extend(BoxVolume &srcVol, const BoxVolume &vol) { if( (!srcVol.isValid () && !srcVol.isEmpty()) || srcVol.isInfinite() || srcVol.isStatic () ) { return; } if(!vol.isValid()) return; if(srcVol.isEmpty()) { if(vol.isEmpty()) { return; } else { srcVol = vol; return; } } else if(vol.isEmpty()) { return; } srcVol.setBounds(osgMin(vol.getMin().x(), srcVol.getMin().x()), osgMin(vol.getMin().y(), srcVol.getMin().y()), osgMin(vol.getMin().z(), srcVol.getMin().z()), osgMax(vol.getMax().x(), srcVol.getMax().x()), osgMax(vol.getMax().y(), srcVol.getMax().y()), osgMax(vol.getMax().z(), srcVol.getMax().z())); if(vol.isInfinite()) srcVol.setInfinite(true); return; }
OSG_BASE_DLLMAPPING bool intersect(const BoxVolume &box, const SphereVolume &sphere) { // source: // J. Arvo. A simple method for box-sphere intersection testing. // In A. Glassner, editor, Graphics Gems, pp. 335-339, // Academic Press, Boston, MA, 1990 bool retCode; if(box.isEmpty() == true || sphere.isEmpty() == true) { retCode = false; } else if(box.isInfinite() == true || sphere.isInfinite() == true) { retCode = true; } else { Real32 s; Real32 d = 0.f; //find the square of the distance from the sphere to the box for(Int32 i = 0; i < 3; i++) { if(sphere.getCenter()[i] < box.getMin()[i]) { s = sphere.getCenter()[i] - box.getMin()[i]; d += s * s; } else if(sphere.getCenter()[i] > box.getMax()[i]) { s = sphere.getCenter()[i] - box.getMax()[i]; d += s * s; } } retCode = (d <= (sphere.getRadius() * sphere.getRadius())); } return retCode; }
OSG_BASE_DLLMAPPING void extend(SphereVolume &srcVol, const BoxVolume &vol) { Pnt3f min, max, min1, max1, c; Real32 r; BoxVolume vol1; vol.getBounds(min, max); if((!srcVol.isValid () && !srcVol.isEmpty()) || srcVol.isInfinite() || srcVol.isStatic () ) { return; } if(!vol.isValid()) return; if(srcVol.isEmpty()) { if(vol.isEmpty()) { return; } else { c = Pnt3f((min.x() + max.x()) * 0.5f, (min.y() + max.y()) * 0.5f, (min.z() + max.z()) * 0.5f); r = ((max - min).length()) / 2; srcVol.setValue(c, r); return; } } else if(vol.isEmpty()) { return; } srcVol.getBounds(min1, max1); vol1.setBounds(osgMin(min.x(), min1.x()), osgMin(min.y(), min1.y()), osgMin(min.z(), min1.z()), osgMax(max.x(), max1.x()), osgMax(max.y(), max1.y()), osgMax(max.z(), max1.z())); vol1.getBounds(min, max); c = Pnt3f((min.x() + max.x()) * 0.5f, (min.y() + max.y()) * 0.5f, (min.z() + max.z()) * 0.5f); r = ((max - min).length()) / 2; srcVol.setValue(c, r); return; }
OSG_BASE_DLLMAPPING bool intersect(const BoxVolume &box, const CylinderVolume &cylinder) { bool retCode; Pnt3f apos; Vec3f adir; cylinder.getAxis(apos, adir); if(box.isEmpty() == true || cylinder.isEmpty() == true) { retCode = false; } else if(box.isInfinite() == true || cylinder.isInfinite() == true) { retCode = true; } else { Real32 s1 = 0, s2 = 0, s3 = 0, s4 = 0, d = 0, d1 = 0, d2 = 0; Pnt3f c, p, p1, p2; Vec3f u, u1, u2; // find the distance between the min and the max of the box //with the lower point and the upper point of the cylinder respectively s1 = (apos - box.getMin()).length(); s2 = (apos - box.getMax()).length(); s3 = (apos + adir - box.getMin()).length(); s4 = (apos + adir - box.getMax()).length(); //Check the minimum of the above distances if(s1 <= s2) { d1 = s1; p1 = box.getMin(); } else { d1 = s2; p1 = box.getMax(); } if(s3 <= s4) { d2 = s3; p2 = box.getMin(); } else { d2 = s4; p2 = box.getMax(); } //set the value of the vector corresponding to the shortest distance if(d1 <= d2) { d = d1; c = apos; p = p1; } else { d = d2; c = apos + adir; p = p2; } // decompose the vector in u1 and u2 which are parallel and // perpendicular to the cylinder axis respectively u = p - c; u1 = (u[0] * adir[0] + u[1] * adir[1] + u[2] * adir[2]) / (adir.length() * adir.length()) * adir; u2 = u - u1; if(u1.length() <= 10e-6) { retCode = true; } else if(u2.length() <= 10e-6) { retCode = (d <= 10e-6); } else { retCode = (u2.length() <= cylinder.getRadius()); } } return retCode; }
OSG_BASE_DLLMAPPING void extend(CylinderVolume &srcVol, const BoxVolume &vol) { Pnt3f min, max, min1, max1, min2, max2, apos; Vec2f p; Vec3f adir; Real32 r; if((!srcVol.isValid () && !srcVol.isEmpty()) || srcVol.isInfinite() || srcVol.isStatic () ) { return; } if(!vol.isValid()) { return; } if(srcVol.isEmpty()) { if(vol.isEmpty()) { return; } else { vol.getBounds(min, max); p = Vec2f(max.x() - min.x(), max.y() - min.y()); r = (p.length()) * 0.5f; adir = Vec3f(0.f, 0.f, max.z() - min.z()); apos = Pnt3f(p.x(), p.y(), min.z()); srcVol.setValue(apos, adir, r); return; } } else if(vol.isEmpty()) { return; } srcVol.getBounds(min, max ); vol .getBounds(min1, max1); min2 = Pnt3f(osgMin(min.x(), min1.x()), osgMin(min.y(), min1.y()), osgMin(min.z(), min1.z())); max2 = Pnt3f(osgMax(max.x(), max1.x()), osgMax(max.y(), max1.y()), osgMax(max.z(), max1.z())); p = Vec2f(max2.x() - min2.x(), max2.y() - min2.y()); r = (p.length()) * 0.5f; adir = Vec3f(0.f, 0.f, max2.z() - min2.z()); apos = Pnt3f(p.x(), p.y(), min2.z()); srcVol.setValue(apos, adir, r); return; }