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Finish implementing capsule vs capsule narrow-phase algorithm

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Daniel Chappuis 2017-03-28 23:07:10 +02:00
parent 050e8b36dc
commit a9b3afae59
1 changed files with 37 additions and 37 deletions
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74
src/collision/narrowphase/CapsuleVsCapsuleAlgorithm.cpp
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@ -66,60 +66,60 @@ bool CapsuleVsCapsuleAlgorithm::testCollision(const NarrowPhaseInfo* narrowPhase
// If the distance between the two segments is larger than the sum of the capsules radius (we do not have overlapping) // If the distance between the two segments is larger than the sum of the capsules radius (we do not have overlapping)
const decimal segmentsDistance = computeDistancePointToLineDistance(capsule1SegA, capsule1SegB, capsule2SegA); const decimal segmentsDistance = computeDistancePointToLineDistance(capsule1SegA, capsule1SegB, capsule2SegA);
if (segmentsDistance >= sumRadius || segmentsDistance < MACHINE_EPSILON) { if (segmentsDistance >= sumRadius) {
// The capsule are parallel but their inner segment distance is larger than the sum of the capsules radius. // The capsule are parallel but their inner segment distance is larger than the sum of the capsules radius.
// Therefore, we do not have overlap. If the inner segments overlap, we do not report any collision. // Therefore, we do not have overlap. If the inner segments overlap, we do not report any collision.
return false; return false;
} }
// Compute the planes that goes through the extrem points of the inner segment of capsule 1 // If the distance between the two segments is larger than zero (inner segments of capsules are not overlapping)
decimal d1 = seg1.dot(capsule1SegA); // If the inner segments are overlapping, we cannot compute a contact normal (unknown direction). In this case,
decimal d2 = -seg1.dot(capsule1SegB); // we skip the parallel contact points calculation (there might still be contact in the spherical caps of the capsules)
if (segmentsDistance > MACHINE_EPSILON) {
// Clip the inner segment of capsule 2 with the two planes that go through extreme points of inner // Compute the planes that goes through the extreme points of the inner segment of capsule 1
// segment of capsule 1 decimal d1 = seg1.dot(capsule1SegA);
decimal t1 = computePlaneSegmentIntersection(capsule2SegB, capsule2SegA, d1, seg1); decimal d2 = -seg1.dot(capsule1SegB);
decimal t2 = computePlaneSegmentIntersection(capsule2SegA, capsule2SegB, d2, -seg1);
bool isClipValid = false; // True if the segments were overlapping (the clip segment is valid) // Clip the inner segment of capsule 2 with the two planes that go through extreme points of inner
// segment of capsule 1
decimal t1 = computePlaneSegmentIntersection(capsule2SegB, capsule2SegA, d1, seg1);
decimal t2 = computePlaneSegmentIntersection(capsule2SegA, capsule2SegB, d2, -seg1);
// Clip the inner segment of capsule 2 // If the segments were overlapping (the clip segment is valid)
Vector3 clipPointA, clipPointB; if (t1 > decimal(0.0) && t2 > decimal(0.0)) {
if (t1 >= decimal(0.0)) {
if (t1 > decimal(1.0)) t1 = decimal(1.0); // Clip the inner segment of capsule 2
clipPointA = capsule2SegB - t1 * seg2; if (t1 > decimal(1.0)) t1 = decimal(1.0);
isClipValid = true; const Vector3 clipPointA = capsule2SegB - t1 * seg2;
} if (t2 > decimal(1.0)) t2 = decimal(1.0);
if (t2 >= decimal(0.0) && t2 <= decimal(1.0)) { const Vector3 clipPointB = capsule2SegA + t2 * seg2;
if (t2 > decimal(1.0)) t2 = decimal(1.0); // Project point capsule2SegA onto line of innner segment of capsule 1
clipPointB = capsule2SegA + t2 * seg2; const Vector3 seg1Normalized = seg1.getUnit();
isClipValid = true; Vector3 pointOnInnerSegCapsule1 = capsule1SegA + seg1Normalized.dot(capsule2SegA - capsule1SegA) * seg1Normalized;
}
// If we have a valid clip segment // Compute a perpendicular vector from segment 1 to segment 2
if (isClipValid) { Vector3 segment1ToSegment2 = (capsule2SegA - pointOnInnerSegCapsule1);
Vector3 segment1ToSegment2Normalized = segment1ToSegment2.getUnit();
Vector3 segment1ToSegment2 = (capsule2SegA - capsule1SegA); Transform capsule2ToCapsule1SpaceTransform = capsule1ToCapsule2SpaceTransform.getInverse();
Vector3 segment1ToSegment2Normalized = segment1ToSegment2.getUnit(); const Vector3 contactPointACapsule1Local = capsule2ToCapsule1SpaceTransform * (clipPointA - segment1ToSegment2 + segment1ToSegment2Normalized * capsuleShape1->getRadius());
const Vector3 contactPointBCapsule1Local = capsule2ToCapsule1SpaceTransform * (clipPointB - segment1ToSegment2 + segment1ToSegment2Normalized * capsuleShape1->getRadius());
const Vector3 contactPointACapsule2Local = clipPointA - segment1ToSegment2Normalized * capsuleShape2->getRadius();
const Vector3 contactPointBCapsule2Local = clipPointB - segment1ToSegment2Normalized * capsuleShape2->getRadius();
Transform capsule2ToCapsule1SpaceTransform = capsule1ToCapsule2SpaceTransform.getInverse(); const Vector3 normalWorld = narrowPhaseInfo->shape2ToWorldTransform.getOrientation() * segment1ToSegment2Normalized;
const Vector3 contactPointACapsule1Local = capsule2ToCapsule1SpaceTransform * (clipPointA - segment1ToSegment2 + segment1ToSegment2Normalized * capsuleShape1->getRadius());
const Vector3 contactPointBCapsule1Local = capsule2ToCapsule1SpaceTransform * (clipPointB - segment1ToSegment2 + segment1ToSegment2Normalized * capsuleShape1->getRadius());
const Vector3 contactPointACapsule2Local = clipPointA - segment1ToSegment2Normalized * capsuleShape2->getRadius();
const Vector3 contactPointBCapsule2Local = clipPointB - segment1ToSegment2Normalized * capsuleShape2->getRadius();
const Vector3 normalWorld = narrowPhaseInfo->shape2ToWorldTransform.getOrientation() * segment1ToSegment2Normalized; decimal penetrationDepth = sumRadius - segmentsDistance;
decimal penetrationDepth = sumRadius - segmentsDistance; // Create the contact info object
contactManifoldInfo.addContactPoint(normalWorld, penetrationDepth, contactPointACapsule1Local, contactPointACapsule2Local);
contactManifoldInfo.addContactPoint(normalWorld, penetrationDepth, contactPointBCapsule1Local, contactPointBCapsule2Local);
// Create the contact info object return true;
contactManifoldInfo.addContactPoint(normalWorld, penetrationDepth, contactPointACapsule1Local, contactPointACapsule2Local); }
contactManifoldInfo.addContactPoint(normalWorld, penetrationDepth, contactPointBCapsule1Local, contactPointBCapsule2Local);
return true;
} }
} }