generate_rectangle()

std::vector< glm::vec3 > MayaFlux::Kinesis::generate_rectangle	(	const glm::vec3 &	center,
		float	width,
		float	height,
		const glm::vec3 &	normal = glm::vec3(0, 0, 1)
	)

Generate vertices of an axis-aligned rectangular path.

Parameters

center	Rectangle centroid
width	Extent along local X axis
height	Extent along local Y axis
normal	Rectangle plane normal

Returns

5 vertices (closed rectangular path for LINE_STRIP)

Definition at line 90 of file GeometryPrimitives.cpp.

{
    glm::vec3 n = glm::normalize(normal);
    glm::vec3 u;
 
    if (std::abs(n.z) < 0.9F) {
        u = glm::normalize(glm::cross(n, glm::vec3(0, 0, 1)));
    } else {
        u = glm::normalize(glm::cross(n, glm::vec3(1, 0, 0)));
    }
 
    glm::vec3 v = glm::cross(n, u);
 
    float half_width = width * 0.5F;
    float half_height = height * 0.5F;
 
    std::vector<glm::vec3> vertices;
    vertices.reserve(5);
 
    vertices.push_back(center - half_width * u - half_height * v);
 
    vertices.push_back(center + half_width * u - half_height * v);
 
    vertices.push_back(center + half_width * u + half_height * v);
 
    vertices.push_back(center - half_width * u + half_height * v);
 
    vertices.push_back(vertices[0]);
 
    return vertices;
}