Unigine::Geometry Class

功能列表:

Name	描述 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.
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	Checks if a segment intersects a plane.
triangleArea	Returns the triangle area.
triangleNormal	Returns the triangle normal vector.
trianglePlane	Returns the triangle plane.
triangleTangent	Returns the triangle tangent space.
TriangleRasterize	Positions the given triangle within the given screen coordinates, rasterizes it and applies the specified shader to each pixel.

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 is put in 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 is put in 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.

bool 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 is put in 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

true if the point is inside the triangle; otherwise, false

bool 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 is put in 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

true if the point is inside the triangle; otherwise, false

bool 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 are put in 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

true if the lines cross; otherwise, false

bool 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 are put in 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

true if the lines cross; otherwise, false

bool 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

true if the given ray intersects the given bounding box; otherwise, false.

bool 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

true if the given ray intersects the given bounding box; otherwise, false.

bool 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.