Intersection structs and functions

Namespace: dmIntersection Language: C++ Type: Defold C++ File: intersection.h Source: engine/dlib/src/dmsdk/dlib/intersection.h Include: dmsdk/dlib/intersection.h

Intersection math structs and functions

API

CreateFrustumFromMatrix

Type: FUNCTION Constructs a dmIntersection::Frustum from a View*Projection matrix

Parameters

• m (dmVMath::Matrix4&) - The matrix. Usually a “ViewProj” matrix
• normalize (bool) - true if the normals should be normalized

Returns

• frustum (dmIntersection::Frustum&) - the frustum output

DistanceToPlane

Type: FUNCTION Returns the closest distance between a plane and a position

Parameters

• plane (dmIntersection::Plane) - plane equation
• pos (dmVMath::Point3) - position

Returns

• distance (float) - closest distance between plane and position

Frustum

Type: STRUCT Frustum

Notes

• The plane normals point inwards

Members

• m_Planes (dmIntersection::Plane[6) - ] plane equations: // left, right, bottom, top, near, far

Plane

Type: TYPEDEF Plane struct (currently an alias for dmVMath::Vector4)

TestFrustumOBB

Type: FUNCTION Tests intersection between a frustum and an oriented bounding box (OBB)

Parameters

• frustum (dmIntersection::Frustum&) - the frustum
• world (dmVMath::Matrix4&) - The world transform of the OBB
• aabb_min (dmVMath::Vector3&) - the minimum corner of the object. In local space.
• aabb_max (dmVMath::Vector3&) - the maximum corner of the object. In local space.
• skip_near_far (bool) - if true, the near+far planes of the frustum are ignored

Returns

• intersects (bool) - Returns true if the objects intersect

TestFrustumPoint

Type: FUNCTION Tests intersection between a frustum and a point

Parameters

• frustum (dmIntersection::Frustum&) - the frustum
• pos (dmVMath::Point3&) - the position
• skip_near_far (bool) - if true, the near+far planes of the frustum are ignored

Returns

• intersects (bool) - Returns true if the objects intersect

TestFrustumSphere

Type: FUNCTION Tests intersection between a frustum and a sphere

Parameters

• frustum (dmIntersection::Frustum&) - the frustum
• pos (dmVMath::Point3&) - the center position of the sphere
• radius (float) - the radius of the sphere
• skip_near_far (bool) - if true, the near+far planes of the frustum are ignored

Returns

• intersects (bool) - Returns true if the objects intersect

TestFrustumSphere

Type: FUNCTION Tests intersection between a frustum and a sphere

Parameters

• frustum (dmIntersection::Frustum&) - the frustum
• pos (dmVMath::Vector4&) - the center position of the sphere. The w component must be 1.
• radius (float) - the radius of the sphere
• skip_near_far (bool) - if true, the near+far planes of the frustum are ignored

Returns

• intersects (bool) - Returns true if the objects intersect

TestFrustumSphereSq

Type: FUNCTION Tests intersection between a frustum and a sphere

Parameters

• frustum (dmIntersection::Frustum&) - the frustum
• pos (dmVMath::Point3&) - the center position of the sphere
• radius_sq (float) - the squared radius of the sphere
• skip_near_far (bool) - if true, the near+far planes of the frustum are ignored

Returns

• intersects (bool) - Returns true if the objects intersect

TestFrustumSphereSq

Type: FUNCTION Tests intersection between a frustum and a sphere

Parameters

• frustum (dmIntersection::Frustum&) - the frustum
• pos (dmVMath::Vector4&) - the center position of the sphere. The w component must be 1.
• radius_sq (float) - the squared radius of the sphere
• skip_near_far (bool) - if true, the near+far planes of the frustum are ignored

Returns

• intersects (bool) - Returns true if the objects intersect