getBoundingBox() --doubt

[hkolli]

hi all ,

when we use getBoundingBox() function we get the values regarding it's x,y,z planes .... how do i access them .

thanks

[vitek]

The bounding box just knows the min and max of the bounding area. It knows nothing about orientation. Well, it is always oriented with the coordinate system axes, so the orientation of the box is always the identity matrix.

In model space the planes are just this...

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core::plane3df xy(0, 0, 0, 0, 0, 1);
core::plane3df xz(0, 0, 0, 0, 1, 0);
core::plane3df yz(0, 0, 0, 1, 0, 0);

If you want that information in some other coordinate system, you need to apply the appropriate matrix transform to the plane.

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// this would transform the above planes into world space
node->getAbsoluteTransformation().transformPlane(xy);
node->getAbsoluteTransformation().transformPlane(xz);
node->getAbsoluteTransformation().transformPlane(yz);

It sounds like you may want the planes of the axis aligned box. If you want this, then you need to do no rotation, you just need to offset the plane position by half of the box extents.

[hkolli]

hi

is the following code not valid


// D3DRMBOX box;
core::aabbox3d<f32> Box;

//meshBuilder -> GetBox( &box );
Box=anode->getBoundingBox();
s32 sizex = Box.T maxx - Box.T minx;
s32 sizey = Box.T maxy - Box.T miny;
s32 sizez = Box.T maxz - Box.T minz;
// Find the average of the flyer's three dimensions.
size = ( sizex + sizey + sizez ) / 3.0;

thanks
hkolli

[hkolli]

hi ,


is this correct


Box=anode->getBoundingBox();
s32 sizex = Box.T maxx - Box.T minx;
s32 sizey = Box.T maxy - Box.T miny;
s32 sizez = Box.T maxz - Box.T minz;

thanks
hkolli

[vitek]

Well, it would be simpler to say...

Code: Select all

core::vector3df size = node->getBoundingBox().getExtent();
// size.x, y and z are the dimensions of the box

core::vector3df center = node->getBoundingBox().getCenter();
// center.x, y and z mark the center of the bounding box

[hkolli]

thanks

vitek