Detailed Description

See also:: Class RenderGlobalContext, Class RenderInstance, Class ISectList.

Remarks:: This structure is available in release 2.0 and later only.
This structure is updated by the RenderGlobalContext::IntersectWorld() and RenderGlobalContext::IntersectRay() methods. It stores information about the intersection of a ray and a single triangle in a mesh.

#include <imtl.h>

Inheritance diagram for ISect:

Public Attributes
float	t
	The ray that was intersected has a unit vector specifying a direction.
BOOL	exit
	TRUE if the ray is exiting the object; otherwise FALSE.
BOOL	backFace
	TRUE if the ray hits a back face of the triangle; otherwise FALSE.
RenderInstance *	inst
	Points to the render instance associated with this triangle hit.
int	fnum
	The face number of the triangle.
Point3	bc
	The barycentric coordinates of the intersection.
Point3	p
	The intersection point in object coordinates.
Point3	pc
	The intersection point in camera coordinates.
ULONG	matreq
	The material requirements of the intersected face.
int	mtlNum
	The material number for a multi-material.
ISect *	next
	Points to the next ISect structure in the list.

Member Data Documentation

float t

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The ray that was intersected has a unit vector specifying a direction.

The ray defines an infinite line in the specified direction. If you take this value t and multiply it by the direction itself it gives a point on the ray. This specifies a distance along the vector. For instance if this way 5.0, the point would 5.0 units along the ray vector. This is the point of intersection along the ray.

BOOL exit

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TRUE if the ray is exiting the object; otherwise FALSE.

BOOL backFace

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TRUE if the ray hits a back face of the triangle; otherwise FALSE.

RenderInstance* inst

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Points to the render instance associated with this triangle hit.

int fnum

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The face number of the triangle.