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#pragma BLENDER_REQUIRE(common_math_geom_lib.glsl)
/**
* Geometric shape structures.
* Some constructors might seems redundant but are here to make the API cleaner and
* allow for more than one constructor per type.
*/
/* ---------------------------------------------------------------------- */
/** \name Circle
* \{ */
struct Circle {
vec2 center;
float radius;
};
Circle shape_circle(vec2 center, float radius)
{
return Circle(center, radius);
}
/** \} */
/* ---------------------------------------------------------------------- */
/** \name Sphere
* \{ */
struct Sphere {
vec3 center;
float radius;
};
Sphere shape_sphere(vec3 center, float radius)
{
return Sphere(center, radius);
}
/** \} */
/* ---------------------------------------------------------------------- */
/** \name Box
* \{ */
struct Box {
vec3 corners[8];
};
/* Construct box from 4 basis points. */
Box shape_box(vec3 v000, vec3 v100, vec3 v010, vec3 v001)
{
v100 -= v000;
v010 -= v000;
v001 -= v000;
Box box;
box.corners[0] = v000;
box.corners[1] = v000 + v100;
box.corners[2] = v000 + v010 + v100;
box.corners[3] = v000 + v010;
box.corners[4] = box.corners[0] + v001;
box.corners[5] = box.corners[1] + v001;
box.corners[6] = box.corners[2] + v001;
box.corners[7] = box.corners[3] + v001;
return box;
}
/** \} */
/* ---------------------------------------------------------------------- */
/** \name Square Pyramid
* \{ */
struct Pyramid {
/* Apex is the first. Base vertices are in clockwise order from front view. */
vec3 corners[5];
};
/**
* Regular Square Pyramid (can be oblique).
* Use this corner order.
* (Top-Down View of the pyramid)
* <pre>
*
* Y
* |
* |
* .-----X
*
* 4-----------3
* | \ / |
* | \ / |
* | 0 |
* | / \ |
* | / \ |
* 1-----------2
* </pre>
* base_corner_00 is vertex 1
* base_corner_01 is vertex 2
* base_corner_10 is vertex 4
*/
Pyramid shape_pyramid(vec3 apex, vec3 base_corner_00, vec3 base_corner_01, vec3 base_corner_10)
{
Pyramid pyramid;
pyramid.corners[0] = apex;
pyramid.corners[1] = base_corner_00;
pyramid.corners[2] = base_corner_01;
pyramid.corners[3] = base_corner_10 + (base_corner_01 - base_corner_00);
pyramid.corners[4] = base_corner_10;
return pyramid;
}
/**
* Regular Square Pyramid.
* <pre>
*
* Y
* |
* |
* .-----X
*
* 4-----Y-----3
* | \ | / |
* | \ | / |
* | 0-----X
* | / \ |
* | / \ |
* 1-----------2
* </pre>
* base_center_pos_x is vector from base center to X
* base_center_pos_y is vector from base center to Y
*/
Pyramid shape_pyramid_non_oblique(vec3 apex,
vec3 base_center,
vec3 base_center_pos_x,
vec3 base_center_pos_y)
{
Pyramid pyramid;
pyramid.corners[0] = apex;
pyramid.corners[1] = base_center - base_center_pos_x - base_center_pos_y;
pyramid.corners[2] = base_center + base_center_pos_x - base_center_pos_y;
pyramid.corners[3] = base_center + base_center_pos_x + base_center_pos_y;
pyramid.corners[4] = base_center - base_center_pos_x + base_center_pos_y;
return pyramid;
}
/** \} */
/* ---------------------------------------------------------------------- */
/** \name Frustum
* \{ */
struct Frustum {
vec3 corners[8];
};
/**
* Use this corner order.
* <pre>
*
* Z Y
* | /
* |/
* .-----X
* 2----------6
* /| /|
* / | / |
* 1----------5 |
* | | | |
* | 3-------|--7
* | / | /
* |/ |/
* 0----------4
* </pre>
*/
Frustum shape_frustum(vec3 corners[8])
{
Frustum frustum;
for (int i = 0; i < 8; i++) {
frustum.corners[i] = corners[i];
}
return frustum;
}
/** \} */
/* ---------------------------------------------------------------------- */
/** \name Cone
* \{ */
/* Cone at orign with no height. */
struct Cone {
vec3 direction;
float angle_cos;
};
Cone shape_cone(vec3 direction, float angle_cosine)
{
return Cone(direction, angle_cosine);
}
/** \} */
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