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https://github.com/Linloir/SceneEditor.git
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Linloir
7321455581
- Add render API in bounding box - Add getter API in renderer to get bounding box
84 lines
4.1 KiB
C++
84 lines
4.1 KiB
C++
#include <algorithm>
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#include <vector>
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#include "boundary.h"
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#include "vao.h"
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void Boundary::updateControlPoints(const glm::vec3 point) {
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_bottomControlPoint.x = std::min(_bottomControlPoint.x, point.x);
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_bottomControlPoint.y = std::min(_bottomControlPoint.y, point.y);
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_bottomControlPoint.z = std::min(_bottomControlPoint.z, point.z);
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_topControlPoint.x = std::max(_topControlPoint.x, point.x);
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_topControlPoint.y = std::max(_topControlPoint.y, point.y);
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_topControlPoint.z = std::max(_topControlPoint.z, point.z);
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}
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bool Boundary::hit(const Ray& ray) const {
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// Test whether the ray intersects with the boundary box
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// The boundary box is defined by the bottom back left control point and the top front right control point
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// The ray is already transformed
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// Test x-axis
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float tmin = (_bottomControlPoint.x - ray.origin().x) / ray.direction().x;
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float tmax = (_topControlPoint.x - ray.origin().x) / ray.direction().x;
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if (tmin > tmax) std::swap(tmin, tmax);
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// Test y-axis
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float tymin = (_bottomControlPoint.y - ray.origin().y) / ray.direction().y;
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float tymax = (_topControlPoint.y - ray.origin().y) / ray.direction().y;
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if (tymin > tymax) std::swap(tymin, tymax);
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// Test z-axis
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float tzmin = (_bottomControlPoint.z - ray.origin().z) / ray.direction().z;
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float tzmax = (_topControlPoint.z - ray.origin().z) / ray.direction().z;
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if (tzmin > tzmax) std::swap(tzmin, tzmax);
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// Test t range of x-y and get the intersection of x-y
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if ((tmin > tymax) || (tymin > tmax)) return false;
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if (tymin > tmin) tmin = tymin;
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if (tymax < tmax) tmax = tymax;
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// Test t range of x-y-z
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if ((tmin > tzmax) || (tzmin > tmax)) return false;
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return true;
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}
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void Boundary::render() const {
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// Generate vertices
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std::vector<Vertex> vertices;
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vertices.push_back(Vertex(glm::vec3(_bottomControlPoint.x, _bottomControlPoint.y, _bottomControlPoint.z)));
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vertices.push_back(Vertex(glm::vec3(_topControlPoint.x, _bottomControlPoint.y, _bottomControlPoint.z)));
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vertices.push_back(Vertex(glm::vec3(_topControlPoint.x, _topControlPoint.y, _bottomControlPoint.z)));
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vertices.push_back(Vertex(glm::vec3(_bottomControlPoint.x, _topControlPoint.y, _bottomControlPoint.z)));
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vertices.push_back(Vertex(glm::vec3(_bottomControlPoint.x, _bottomControlPoint.y, _topControlPoint.z)));
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vertices.push_back(Vertex(glm::vec3(_topControlPoint.x, _bottomControlPoint.y, _topControlPoint.z)));
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vertices.push_back(Vertex(glm::vec3(_topControlPoint.x, _topControlPoint.y, _topControlPoint.z)));
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vertices.push_back(Vertex(glm::vec3(_bottomControlPoint.x, _topControlPoint.y, _topControlPoint.z)));
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// Generate indices
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std::vector<unsigned int> indices;
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indices.push_back(0); indices.push_back(1); indices.push_back(2); indices.push_back(3); // bottom
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indices.push_back(4); indices.push_back(5); indices.push_back(6); indices.push_back(7); // top
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indices.push_back(0); indices.push_back(1); indices.push_back(5); indices.push_back(4); // left
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indices.push_back(3); indices.push_back(2); indices.push_back(6); indices.push_back(7); // right
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indices.push_back(0); indices.push_back(3); indices.push_back(7); indices.push_back(4); // back
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indices.push_back(1); indices.push_back(2); indices.push_back(6); indices.push_back(5); // front
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// Generate VBO
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VertexBufferObject vbo(vertices);
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// Generate EBO
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ElementBufferObject ebo(indices);
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// Generate VAO
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VertexArrayObject vao(vbo, ebo);
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vao.setVertexAttributePointer(0, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)0);
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// Draw
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vao.bind();
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OPENGL_EXTRA_FUNCTIONS->glDrawElements(GL_LINE_LOOP, 4, GL_UNSIGNED_INT, (void*)(0 * sizeof(unsigned int)));
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OPENGL_EXTRA_FUNCTIONS->glDrawElements(GL_LINE_LOOP, 4, GL_UNSIGNED_INT, (void*)(4 * sizeof(unsigned int)));
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OPENGL_EXTRA_FUNCTIONS->glDrawElements(GL_LINE_LOOP, 4, GL_UNSIGNED_INT, (void*)(8 * sizeof(unsigned int)));
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OPENGL_EXTRA_FUNCTIONS->glDrawElements(GL_LINE_LOOP, 4, GL_UNSIGNED_INT, (void*)(12 * sizeof(unsigned int)));
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vao.unbind();
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// Delete VBO and VAO
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vbo.dispose();
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vao.dispose();
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}
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