mav_BBCullToClipPlanes - Bounding box utility functions.

[ Maverik Level 2 functions ]

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mav_BBCullToClipPlanes

mav_BBCullToClipPlanes, mav_BBGetCorner, mav_BBIntersectsLine, mav_BBIntersectsBB, mav_BBIntersectsClipPlanes, mav_BBAlign, mav_BBCompInit, mav_BBCompBB, mav_BBCompPt

## Summary

Bounding box utility functions.

## Syntax

int mav_BBCullToClipPlanes(MAV_BB bb, MAV_clipPlanes cp);

int mav_BBGetCorner(MAV_vector v);

int mav_BBIntersectsLine(MAV_BB bb, MAV_line ln, MAV_objectIntersection *oi);

int mav_BBIntersectsBB(MAV_BB bb1, MAV_BB bb2);

int mav_BBIntersectsClipPlanes(MAV_BB bb, int *clist, MAV_clipPlanes *cp);

void mav_BBAlign(MAV_BB in, MAV_matrix m, MAV_BB *out);

void mav_BBCompInit(MAV_BB *bb);

void mav_BBCompBB(MAV_BB in, MAV_BB *out);

void mav_BBCompPt(MAV_vector v, MAV_BB *bb);

## Description

- mav_BBCullToClipPlanes like mav_BBCull but uses the clip planes given rather than those which correspond to the current viewing frustum.

- mav_BBGetCorner takes a vector `v` defining the normal to a plane, and returns an integer representing which corners of an axis-aligned box need to be tested when testing for intersection against that plane. This means that only 2 corners are tested for each box, instead of 8.

- mav_BBIntersectsLine intersects bounding box `bb` with line `ln` and returns the closest intersection point (if any) in `oi`. The result of the function is MAV_TRUE if an intersection was found, else MAV_FALSE.

- mav_BBIntersectsBB tests for intersects between bounding boxes `bb1` and `bb2`. The result of the function is MAV_TRUE if they intersect, else MAV_FALSE.

- mav_BBIntersectsClipPlanes intersects an axis-aligned box `bb` with a set of clip planes `cp`. A return value of 0 indicates no intersection; of 1 indicates the box is entirely inside clip planes, 2 = box crosses clip planes.

- mav_BBAlign takes the axis-aligned bounding box `in`, transforms it with matrix `m`, and then transforms it again to align it with the world coordinate axes.

The following functions are for computing the bounding box of a composite object.

- mav_BBCompInit initialises the bounding box `bb`.

- mav_BBCompBB calculates the enclosing bounding box of two separate bounding boxes, `in` and `out`. The resulting bounding box overwrites `out`.

- mav_BBCompPt calculates the enclosing bounding box of bounding box `bb` and point `v`. The resulting bounding box overwrites `bb`.

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