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implement improvement in sphere test

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This commit is contained in:
Brad Hefta-Gaub 2015-10-21 10:46:50 -07:00
parent 6465bb85dd
commit 246e46b69a
2 changed files with 31 additions and 17 deletions
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4
libraries/entities/src/EntityItemPropertiesDefaults.h
View file

@ -21,8 +21,8 @@
// There is a minor performance gain when comparing/copying an existing glm::vec3 rather than
// creating a new one on the stack so we declare the ZERO_VEC3 constant as an optimization.
const glm::vec3 ENTITY_ITEM_ZERO_VEC3 = glm::vec3(0.0f);
const glm::vec3 ENTITY_ITEM_ONE_VEC3 = glm::vec3(1.0f, 1.0f, 1.0f);
const glm::vec3 ENTITY_ITEM_HALF_VEC3 = ENTITY_ITEM_ONE_VEC3 / 2.0f;
const glm::vec3 ENTITY_ITEM_ONE_VEC3 = glm::vec3(1.0f);
const glm::vec3 ENTITY_ITEM_HALF_VEC3 = glm::vec3(0.5f);
const bool ENTITY_ITEM_DEFAULT_LOCKED = false;
const QString ENTITY_ITEM_DEFAULT_USER_DATA = QString("");

44
libraries/entities/src/EntityTreeElement.cpp
View file

@ -648,7 +648,6 @@ EntityItemPointer EntityTreeElement::getClosestEntity(glm::vec3 position) const
// TODO: change this to use better bounding shape for entity than sphere
void EntityTreeElement::getEntities(const glm::vec3& searchPosition, float searchRadius, QVector<EntityItemPointer>& foundEntities) const {
float compareRadius = searchRadius * searchRadius;
forEachEntity([&](EntityItemPointer entity) {
AABox entityBox = entity->getAABox();
@ -657,26 +656,41 @@ void EntityTreeElement::getEntities(const glm::vec3& searchPosition, float searc
glm::vec3 penetration;
if (entityBox.findSpherePenetration(searchPosition, searchRadius, penetration)) {
// FIXME - handle entity->getShapeType() == SHAPE_TYPE_SPHERE case better
glm::vec3 dimensions = entity->getDimensions();
// FIXME - consider allowing the entity to determine penetration so that
// entities could presumably dull actuall hull testing if they wanted to
// FIXME - handle entity->getShapeType() == SHAPE_TYPE_SPHERE case better in particular
// can we handle the ellipsoid case better? We only currently handle perfect spheres
// with centered registration points
if (entity->getShapeType() == SHAPE_TYPE_SPHERE &&
(dimensions.x == dimensions.y && dimensions.y == dimensions.z)) {
// determine the worldToEntityMatrix that doesn't include scale because
// we're going to use the registration aware aa box in the entity frame
glm::mat4 rotation = glm::mat4_cast(entity->getRotation());
glm::mat4 translation = glm::translate(entity->getPosition());
glm::mat4 entityToWorldMatrix = translation * rotation;
glm::mat4 worldToEntityMatrix = glm::inverse(entityToWorldMatrix);
// NOTE: entity->getRadius() doesn't return the true radius, it returns the radius of the
// maximum bounding sphere, which is actually larger than our actual radius
float entityTrueRadius = dimensions.x / 2.0f;
glm::vec3 dimensions = entity->getDimensions();
glm::vec3 registrationPoint = entity->getRegistrationPoint();
glm::vec3 corner = -(dimensions * registrationPoint);
if (findSphereSpherePenetration(searchPosition, searchRadius,
entity->getCenterPosition(), entityTrueRadius, penetration)) {
foundEntities.push_back(entity);
}
} else {
// determine the worldToEntityMatrix that doesn't include scale because
// we're going to use the registration aware aa box in the entity frame
glm::mat4 rotation = glm::mat4_cast(entity->getRotation());
glm::mat4 translation = glm::translate(entity->getPosition());
glm::mat4 entityToWorldMatrix = translation * rotation;
glm::mat4 worldToEntityMatrix = glm::inverse(entityToWorldMatrix);
AABox entityFrameBox(corner, dimensions);
glm::vec3 registrationPoint = entity->getRegistrationPoint();
glm::vec3 corner = -(dimensions * registrationPoint);
glm::vec3 entityFrameSearchPosition = glm::vec3(worldToEntityMatrix * glm::vec4(searchPosition, 1.0f));
if (entityFrameBox.findSpherePenetration(entityFrameSearchPosition, searchRadius, penetration)) {
foundEntities.push_back(entity);
AABox entityFrameBox(corner, dimensions);
glm::vec3 entityFrameSearchPosition = glm::vec3(worldToEntityMatrix * glm::vec4(searchPosition, 1.0f));
if (entityFrameBox.findSpherePenetration(entityFrameSearchPosition, searchRadius, penetration)) {
foundEntities.push_back(entity);
}
}
}
});