Unigine::Geometry Class

Header:

#include <UnigineGeometry.h>

This class is used to represent a collection of generic 3d math functions such as line plane intersection, closest points on two lines, etc.

Methods:

Name	Description View: Sort by:
getClosestPointOnLine	Scans the specified line segment and searches for the point closest to the reference point.
getClosestPointOnTriangle	Scans the specified triangle and searches for the point closest to the reference point.
getClosestPointsOnLines	Scans the two specified lines and searches for the pair of closest points.
irayBoundBoxIntersection	Checks if there is an intersection between a ray and a bounding box.
linePlaneIntersection	Checks if there is an intersection between a line and a plane.
normalizeAngle	Normalizes the angle in [-180, 180 ] range.
orthoBasis	Creates an ortho transformation.
orthoTangent	Creates the ortho triangle tangent space basis.
orthoTransform	Creates an ortho transformation.
pointPolygonDistance	Returns the distance from a point to a polygon.
pointPolygonInside	Checks if a point is inside a polygon.
pointTriangleCoordinates	Calculates barycentric triangle coordinates.
pointTriangleDistance	Returns the closest distance from a point to a triangle.
pointTriangleInside	Checks if a point is inside a triangle.
polygonPlane	Returns the polygon plane.
projectOntoPlane	Calculates the projection of a vector onto a given plane.
rayBoundBoxIntersection	Checks if a ray intersects a bounding box.
rayPlaneIntersection	Checks if a ray intersects a plane.
rayTriangleIntersection	Checks if a ray intersects a triangle.
segmentPlaneIntersection	Calculates the intersection of a segment and a plane.
triangleArea	Returns the triangle area.
triangleNormal	Returns the triangle normal vector.
trianglePlane	Returns the triangle plane.
triangleTangent	Returns the triangle tangent space.

Geometry Class

Members

void getClosestPointOnLine ( const Math::dvec3 & point, const Math::dvec3 & p0, const Math::dvec3 & p1, Math::dvec3 & ret ) #

Scans the specified line segment and searches for the point closest to the reference point. The found point will be put to the return vector.

Arguments

const Math::dvec3 & point - Reference point.
const Math::dvec3 & p0 - Line start point.
const Math::dvec3 & p1 - Line end point.
Math::dvec3 & ret - Return vector.

void getClosestPointOnLine ( const Math::vec3 & point, const Math::vec3 & p0, const Math::vec3 & p1, Math::vec3 & ret ) #

Scans the specified line segment and searches for the point closest to the reference point. The found point will be put to the return vector.

Arguments

const Math::vec3 & point - Reference point.
const Math::vec3 & p0 - Line start point.
const Math::vec3 & p1 - Line end point.
Math::vec3 & ret - Return vector.

int getClosestPointOnTriangle ( const Math::dvec3 & point, const Math::dvec3 & v0, const Math::dvec3 & v1, const Math::dvec3 & v2, Math::dvec3 & ret ) #

Scans the specified triangle and searches for the point closest to the reference point. The found point will be put to the return vector.

Arguments

const Math::dvec3 & point - Reference point.
const Math::dvec3 & v0 - The first vertex of the triangle.
const Math::dvec3 & v1 - The second vertex of the triangle.
const Math::dvec3 & v2 - The third vertex of the triangle.
Math::dvec3 & ret - Return vector.

Return value

1 if the point is inside the triangle; otherwise, 0

int getClosestPointOnTriangle ( const Math::vec3 & point, const Math::vec3 & v0, const Math::vec3 & v1, const Math::vec3 & v2, Math::vec3 & ret ) #

Scans the specified triangle and searches for the point closest to the reference point. The found point will be put to the return vector.

Arguments

const Math::vec3 & point - Reference point.
const Math::vec3 & v0 - The first vertex of the triangle.
const Math::vec3 & v1 - The second vertex of the triangle.
const Math::vec3 & v2 - The third vertex of the triangle.
Math::vec3 & ret - Return vector.

Return value

1 if the point is inside the triangle; otherwise, 0

int getClosestPointsOnLines ( const Math::dvec3 & p00, const Math::dvec3 & p01, const Math::dvec3 & p10, const Math::dvec3 & p11, Math::dvec3 & ret_0, Math::dvec3 & ret_1 ) #

Scans the two specified lines and searches for the pair of closest points. The closest points of the first and the second lines will be put to the respective return vector.

Arguments

const Math::dvec3 & p00 - Start point of the first line.
const Math::dvec3 & p01 - End point of the first line.
const Math::dvec3 & p10 - Start point of the second line.
const Math::dvec3 & p11 - End point of the second line.
Math::dvec3 & ret_0 - First return vector.
Math::dvec3 & ret_1 - Second return vector.

Return value

1 if the lines cross; otherwise, 0

int getClosestPointsOnLines ( const Math::vec3 & p00, const Math::vec3 & p01, const Math::vec3 & p10, const Math::vec3 & p11, Math::vec3 & ret_0, Math::vec3 & ret_1 ) #

Scans the two specified lines and searches for the pair of closest points. The closest points of the first and the second lines will be put to the respective return vectors.

Arguments

const Math::vec3 & p00 - Start point of the first line.
const Math::vec3 & p01 - End point of the first line.
const Math::vec3 & p10 - Start point of the second line.
const Math::vec3 & p11 - End point of the second line.
Math::vec3 & ret_0 - First return vector.
Math::vec3 & ret_1 - Second return vector.

Return value

1 if the lines cross; otherwise, 0

int irayBoundBoxIntersection ( const Math::dvec3 & point, const Math::dvec3 & idirection, const Math::dvec3 & min, const Math::dvec3 & max ) #

Checks if there is an intersection between a ray and a bounding box. The same function as rayBoundBoxIntersection(), but it uses the inverse of the ray direction, which increases performance.

Arguments

const Math::dvec3 & point - Starting point of the ray.
const Math::dvec3 & idirection - Inverse direction of the ray.
const Math::dvec3 & min - Min coordinates of the axis-aligned bounding box.
const Math::dvec3 & max - Max coordinates of the axis-aligned bounding box.

Return value

1 if the given ray intersects the given bounding box; otherwise, 0.

int irayBoundBoxIntersection ( const Math::vec3 & point, const Math::vec3 & idirection, const Math::vec3 & min, const Math::vec3 & max ) #

Checks if there is an intersection between a ray and a bounding box. The same function as rayBoundBoxIntersection(), but it uses the inverse of the ray direction, which increases performance.

Arguments

const Math::vec3 & point - Starting point of the ray.
const Math::vec3 & idirection - Inverse direction of the ray.
const Math::vec3 & min - Min coordinates of the axis-aligned bounding box.
const Math::vec3 & max - Max coordinates of the axis-aligned bounding box.

Return value

1 if the given ray intersects the given bounding box; otherwise, 0.

int linePlaneIntersection ( const Math::vec3 & p0, const Math::vec3 & p1, const Math::vec4 & plane ) #

Checks if there is an intersection between a line and a plane.

Arguments

const Math::vec3 & p0 - Start point of the line.
const Math::vec3 & p1 - End point of the line.
const Math::vec4 & plane - Plane.

Return value

1 if the given line intersects the given plane; otherwise, 0.

int linePlaneIntersection ( const Math::vec3 & p0, const Math::vec3 & p1, const Math::vec3 & plane_point, const Math::vec3 & plane_normal, Math::vec3 & ret ) #

Calculates the intersection of a line and a plane. If the function returns 1, the point of intersection will be put to the return vector.

Arguments

const Math::vec3 & p0 - Start point of the line.
const Math::vec3 & p1 - End point of the line.
const Math::vec3 & plane_point - Point of the plane.
const Math::vec3 & plane_normal - Normal to the plane.
Math::vec3 & ret - Return vector.

Return value

1 if the given line intersects the given plane; otherwise, 0.

int linePlaneIntersection ( const Math::dvec3 & p0, const Math::dvec3 & p1, const Math::dvec3 & plane_point, const Math::dvec3 & plane_normal ) #

Checks if there is an intersection between a line and a plane.

Arguments

const Math::dvec3 & p0 - Start point of the line.
const Math::dvec3 & p1 - Start point of the line.
const Math::dvec3 & plane_point - Point of the plane.
const Math::dvec3 & plane_normal - Normal to the plane.

Return value

1 if the given line intersects the given plane; otherwise, 0.

int linePlaneIntersection ( const Math::dvec3 & p0, const Math::dvec3 & p1, const Math::dvec3 & plane_point, const Math::dvec3 & plane_normal, Math::dvec3 & ret ) #

Calculates the intersection of a line and a plane. If the function returns 1, the point of intersection will be put to the return vector.

Arguments

const Math::dvec3 & p0 - Start point of the line.
const Math::dvec3 & p1 - End point of the line.
const Math::dvec3 & plane_point - Point of the plane.
const Math::dvec3 & plane_normal - Normal to the plane.
Math::dvec3 & ret - Return vector.

Return value

1 if the given line intersects the given plane; otherwise, 0.

int linePlaneIntersection ( const Math::vec3 & p0, const Math::vec3 & p1, const Math::vec3 & plane_point, const Math::vec3 & plane_normal ) #

Checks if there is an intersection between a line and a plane.

Arguments

const Math::vec3 & p0 - Start point of the line.
const Math::vec3 & p1 - End point of the line.
const Math::vec3 & plane_point - Point of the plane.
const Math::vec3 & plane_normal - Normal to the plane.

Return value

1 if the given line intersects the given plane; otherwise, 0.

int linePlaneIntersection ( const Math::dvec3 & p0, const Math::dvec3 & p1, const Math::dvec4 & plane, Math::dvec3 & ret ) #

Calculates the intersection of a line and a plane. If the function returns 1, the point of intersection will be put to the return vector.

Arguments

const Math::dvec3 & p0 - Start point of the line.
const Math::dvec3 & p1 - End point of the line.
const Math::dvec4 & plane - Plane.
Math::dvec3 & ret - Return vector.

Return value

1 if the given line intersects the given plane; otherwise, 0.

int linePlaneIntersection ( const Math::vec3 & p0, const Math::vec3 & p1, const Math::vec4 & plane, Math::vec3 & ret ) #

Calculates the intersection of a line and a plane. If the function returns 1, the point of intersection will be put to the return vector.

Arguments

const Math::vec3 & p0 - Start point of the line.
const Math::vec3 & p1 - End point of the line.
const Math::vec4 & plane - Plane.
Math::vec3 & ret - Return vector.

Return value

1 if the given line intersects the given plane; otherwise, 0.

int linePlaneIntersection ( const Math::dvec3 & p0, const Math::dvec3 & p1, const Math::dvec4 & plane ) #

Checks if there is an intersection between a line and a plane.

Arguments

const Math::dvec3 & p0 - Start point of the line.
const Math::dvec3 & p1 - End point of the line.
const Math::dvec4 & plane - Plane.

Return value

1 if the given line intersects the given plane; otherwise, 0.

float normalizeAngle ( float angle ) #

Normalizes the angle in [-180, 180 ] range.

Arguments

float angle - Input angle.

Return value

Normalized angle, in degrees.

void orthoBasis ( const Math::vec3 & v, Math::vec3 & tangent, Math::vec3 & binormal ) #

Creates an ortho transformation. Output tangent and binormal vectors will be put to corresponding return vector.

Arguments

const Math::vec3 & v - Input vector.
Math::vec3 & tangent - Return vector.
Math::vec3 & binormal - Return vector.

void orthoBasis ( const Math::dvec3 & v, Math::dvec3 & tangent, Math::dvec3 & binormal ) #

Creates an ortho transformation. Output tangent and binormal vectors will be put to corresponding return vectors.

Arguments

const Math::dvec3 & v - Input vector.
Math::dvec3 & tangent - Return vector.
Math::dvec3 & binormal - Return vector.

Math::quat orthoTangent ( const Math::vec3 & tangent, const Math::vec3 & binormal, const Math::vec3 & normal ) #

Creates the ortho triangle tangent space basis.

Arguments

const Math::vec3 & tangent - Tangent vector.
const Math::vec3 & binormal - Binormal vector.
const Math::vec3 & normal - Normal vector.

Return value

Tangent basis.

Math::quat orthoTangent ( const Math::vec4 & tangent, const Math::vec3 & normal ) #

Creates the ortho triangle tangent space basis.

Arguments

const Math::vec4 & tangent - Tangent vector.
const Math::vec3 & normal - Normal vector.

Return value

Tangent basis.

void orthoTransform ( const Math::dvec3 & v, Math::dmat4 & transform ) #

Creates an ortho transformation. The transformation will be put to the return matrix.

Arguments

const Math::dvec3 & v - Input vector.
Math::dmat4 & transform - Return matrix.

void orthoTransform ( const Math::vec3 & v, Math::mat4 & transform ) #

Creates an ortho transformation. The transformation will be put to the return matrix.

Arguments

const Math::vec3 & v - Input vector.
Math::mat4 & transform - Return matrix.

float pointPolygonDistance ( const Math::vec3 & point, const Math::vec3 * vertex, int[] indices, const Math::vec4 & plane ) #

Returns the distance from a point to a polygon.

Arguments

const Math::vec3 & point - Point.
const Math::vec3 * vertex - Pointer to vertex structure.
int[] indices - Array of vertex indices.
const Math::vec4 & plane - Polygon plane.

Return value

Distance.

double pointPolygonDistance ( const Math::dvec3 & point, const Math::dvec3 * vertex, int[] indices, const Math::dvec4 & plane ) #

Returns the distance from a point to a polygon.

Arguments

const Math::dvec3 & point - Point.
const Math::dvec3 * vertex - Pointer to vertex structure.
int[] indices - Array of vertex indices.
const Math::dvec4 & plane - Polygon plane.

Return value

Distance.

int pointPolygonInside ( const Math::vec3 & point, const Math::vec3 * vertex, int[] indices, const Math::vec3 & normal ) #

Checks if a point is inside a polygon.

Arguments

const Math::vec3 & point - Point.
const Math::vec3 * vertex - Pointer to vertex structure.
int[] indices - Array of vertex indices.
const Math::vec3 & normal - Normal to the polygon plane.

Return value

1 if the point is inside the given polygon; otherwise, 0.

int pointPolygonInside ( const Math::dvec3 & point, const Math::dvec3 * vertex, int[] indices, const Math::dvec3 & normal ) #

Checks if a point is inside a polygon.

Arguments

const Math::dvec3 & point - Point.
const Math::dvec3 * vertex - Pointer to vertex structure.
int[] indices - Array of vertex indices.
const Math::dvec3 & normal - Normal to the polygon plane.

Return value

1 if the point is inside the given polygon; otherwise, 0.

void pointTriangleCoordinates ( const Math::vec3 & point, const Math::vec3 & v0, const Math::vec3 & v1, const Math::vec3 & v2, float & a, float & b ) #

Calculates barycentric triangle coordinates. The coordinates will be put to corresponding return variables.

Arguments

const Math::vec3 & point - Point.
const Math::vec3 & v0 - The first vertex of the triangle.
const Math::vec3 & v1 - The second vertex of the triangle.
const Math::vec3 & v2 - The third vertex of the triangle.
float & a - Return variable.
float & b - Return variable.

void pointTriangleCoordinates ( const Math::dvec3 & point, const Math::dvec3 & v0, const Math::dvec3 & v1, const Math::dvec3 & v2, double & a, double & b ) #

Calculates barycentric triangle coordinates. The coordinates will be put to corresponding return variables.

Arguments

const Math::dvec3 & point - Point.
const Math::dvec3 & v0 - The first vertex of the triangle.
const Math::dvec3 & v1 - The second vertex of the triangle.
const Math::dvec3 & v2 - The third vertex of the triangle.
double & a - Return variable.
double & b - Return variable.

double pointTriangleDistance ( const Math::dvec3 & point, const Math::dvec3 & v0, const Math::dvec3 & v1, const Math::dvec3 & v2, const Math::dvec4 & plane ) #

Returns the closest distance from a point to a triangle.

Arguments

const Math::dvec3 & point - Point.
const Math::dvec3 & v0 - The first vertex of the triangle.
const Math::dvec3 & v1 - The second vertex of the triangle.
const Math::dvec3 & v2 - The third vertex of the triangle.
const Math::dvec4 & plane - Triangle plane.

Return value

Distance.

float pointTriangleDistance ( const Math::vec3 & point, const Math::vec3 & v0, const Math::vec3 & v1, const Math::vec3 & v2, const Math::vec4 & plane ) #

Returns the closest distance from a point to a triangle.

Arguments

const Math::vec3 & point - Point.
const Math::vec3 & v0 - The first vertex of the triangle.
const Math::vec3 & v1 - The second vertex of the triangle.
const Math::vec3 & v2 - The third vertex of the triangle.
const Math::vec4 & plane - Triangle plane.

Return value

Distance.

int pointTriangleInside ( const Math::vec3 & point, const Math::vec3 & v0, const Math::vec3 & v1, const Math::vec3 & v2, const Math::vec3 & normal ) #

Checks if a point is inside a triangle.

Arguments

const Math::vec3 & point - Point.
const Math::vec3 & v0 - The first vertex of the triangle.
const Math::vec3 & v1 - The second vertex of the triangle.
const Math::vec3 & v2 - The third vertex of the triangle.
const Math::vec3 & normal - Normal to the triangle plane.

Return value

1 if the point is inside the given triangle; otherwise, 0.

int pointTriangleInside ( const Math::dvec3 & point, const Math::dvec3 & v0, const Math::dvec3 & v1, const Math::dvec3 & v2, const Math::dvec3 & normal ) #

Checks if a point is inside a triangle.

Arguments

const Math::dvec3 & point - Point.
const Math::dvec3 & v0 - The first vertex of the triangle.
const Math::dvec3 & v1 - The second vertex of the triangle.
const Math::dvec3 & v2 - The third vertex of the triangle.
const Math::dvec3 & normal - Normal to the triangle plane.

Return value

1 if the point is inside the given triangle; otherwise, 0.

int pointTriangleInside ( const Math::dvec3 & point, const Math::dvec3 & v0, const Math::dvec3 & v1, const Math::dvec3 & v2 ) #

Checks if a point is inside a triangle.

Arguments

const Math::dvec3 & point - Point.
const Math::dvec3 & v0 - The first vertex of the triangle.
const Math::dvec3 & v1 - The second vertex of the triangle.
const Math::dvec3 & v2 - The third vertex of the triangle.

Return value

1 if the point is inside the given triangle; otherwise, 0.

int pointTriangleInside ( const Math::vec3 & point, const Math::vec3 & v0, const Math::vec3 & v1, const Math::vec3 & v2 ) #

Checks if a point is inside a triangle.

Arguments

const Math::vec3 & point - Point.
const Math::vec3 & v0 - The first vertex of the triangle.
const Math::vec3 & v1 - The second vertex of the triangle.
const Math::vec3 & v2 - The third vertex of the triangle.

Return value

1 if the point is inside the given triangle; otherwise, 0.

Math::vec4 polygonPlane ( const Math::vec3 * vertex, int[] indices ) #

Returns the polygon plane.

Arguments

const Math::vec3 * vertex - Pointer to vertex structure.
int[] indices - Array of vertex indices.

Return value

Polygon plane.

Math::dvec4 polygonPlane ( const Math::dvec3 * vertex, int[] indices ) #

Returns the polygon plane.

Arguments

const Math::dvec3 * vertex - Pointer to vertex structure.
int[] indices - Array of vertex indices.

Return value

Polygon plane.

Math::vec3 projectOntoPlane ( const Math::vec3 & v, const Math::vec3 & plane_normal ) #

Calculates the projection of a vector onto a given plane.

Arguments

const Math::vec3 & v - Input vector.
const Math::vec3 & plane_normal - Normal to the plane.

Return value

Projection of the input vector onto the plane.

Math::dvec3 projectOntoPlane ( const Math::dvec3 & v, const Math::dvec3 & plane_normal ) #

Calculates the projection of a vector onto a given plane.

Arguments

const Math::dvec3 & v - Input vector.
const Math::dvec3 & plane_normal - Normal to the plane.

Return value

Projection of the input vector onto the plane.

int rayBoundBoxIntersection ( const Math::dvec3 & point, const Math::dvec3 & direction, const Math::dvec3 & min, const Math::dvec3 & max ) #

Checks if a ray intersects a bounding box. The same function as irayBoundBoxIntersection(), but the latter has higher performance due to reduction of division operations, as the ray direction is replaced by the pre-calculated inverse of the ray direction.

Arguments

const Math::dvec3 & point - Starting point of the ray.
const Math::dvec3 & direction - Direction of the ray.
const Math::dvec3 & min - Min coordinates of the axis-aligned bounding box.
const Math::dvec3 & max - Max coordinates of the axis-aligned bounding box.

Return value

1 if the given ray intersects the given bounding box; otherwise, 0.

int rayBoundBoxIntersection ( const Math::vec3 & point, const Math::vec3 & direction, const Math::vec3 & min, const Math::vec3 & max ) #

Arguments

const Math::vec3 & point - Starting point of the ray.
const Math::vec3 & direction - Direction of the ray.
const Math::vec3 & min - Min coordinates of the axis-aligned bounding box.
const Math::vec3 & max - Max coordinates of the axis-aligned bounding box.

Return value

1 if the given ray intersects the given bounding box; otherwise, 0.

int rayPlaneIntersection ( const Math::vec3 & point, const Math::vec3 & direction, const Math::vec4 & plane ) #

Checks if a ray intersects a plane.