VMAP::MyCollisionDetection Class Reference

#include <VMapTools.h>

Static Public Member Functions
static bool	collisionLocationForMovingPointFixedAABox (const G3D::Vector3 &origin, const G3D::Vector3 &dir, const G3D::AABox &box, G3D::Vector3 &location, bool &Inside)

Member Function Documentation

static bool VMAP::MyCollisionDetection::collisionLocationForMovingPointFixedAABox ( const G3D::Vector3 &  origin, const G3D::Vector3 &  dir, const G3D::AABox &  box, G3D::Vector3 &  location, bool &  Inside  )

inlinestatic

 {

 // Integer representation of a floating-point value.
#define IR(x) (reinterpret_cast<G3D::uint32 const&>(x))

 Inside = true;
 const G3D::Vector3& MinB = box.low();
 const G3D::Vector3& MaxB = box.high();
 G3D::Vector3 MaxT(-1.0f, -1.0f, -1.0f);

 // Find candidate planes.
 for (int i = 0; i < 3; ++i)
 {
 if (origin[i] < MinB[i])
 {
 location[i] = MinB[i];
 Inside = false;

 // Calculate T distances to candidate planes
 if (IR(dir[i]))
 {
 MaxT[i] = (MinB[i] - origin[i]) / dir[i];
 }
 }
 else if (origin[i] > MaxB[i])
 {
 location[i] = MaxB[i];
 Inside = false;

 // Calculate T distances to candidate planes
 if (IR(dir[i]))
 {
 MaxT[i] = (MaxB[i] - origin[i]) / dir[i];
 }
 }
 }

 if (Inside)
 {
 // definite hit
 location = origin;
 return true;
 }

 // Get largest of the maxT's for final choice of intersection
 int WhichPlane = 0;
 if (MaxT[1] > MaxT[WhichPlane])
 {
 WhichPlane = 1;
 }

 if (MaxT[2] > MaxT[WhichPlane])
 {
 WhichPlane = 2;
 }

 // Check final candidate actually inside box
 if (IR(MaxT[WhichPlane]) & 0x80000000)
 {
 // Miss the box
 return false;
 }

 for (int i = 0; i < 3; ++i)
 {
 if (i != WhichPlane)
 {
 location[i] = origin[i] + MaxT[WhichPlane] * dir[i];
 if ((location[i] < MinB[i]) ||
 (location[i] > MaxB[i]))
 {
 // On this plane we're outside the box extents, so
 // we miss the box
 return false;
 }
 }
 }
 /*
 // Choose the normal to be the plane normal facing into the ray
 normal = G3D::Vector3::zero();
 normal[WhichPlane] = (dir[WhichPlane] > 0) ? -1.0 : 1.0;
 */
 return true;

#undef IR
 }

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The documentation for this class was generated from the following file:

• src/common/Collision/VMapTools.h