87 lines
2.9 KiB
C
87 lines
2.9 KiB
C
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/*
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* Created by Brett on 10/03/23.
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* Licensed under GNU General Public License V3.0
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* See LICENSE file for license detail
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*/
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// internal types used by graphics to prevent cluttering of the main graphics.cpp file. Do not include elsewhere.
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#ifndef FINALPROJECT_PLANES_H
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#define FINALPROJECT_PLANES_H
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#include <blt/math/vectors.h>
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#include <blt/math/matrix.h>
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#include <blt/std/logging.h>
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#include <blt/math/log_util.h>
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#include <memory>
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#include <array>
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namespace fp::graphics {
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typedef struct {
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float x,y,z;
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} plane_vertex;
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inline plane_vertex blt_toVertex(const blt::vec3& v){
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return plane_vertex{v.x(), v.y(), v.z()};
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}
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struct plane_model {
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std::array<plane_vertex, 4> vertices;
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std::array<unsigned int, 6> indices;
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plane_model(
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const std::array<plane_vertex, 4>& vertices, const std::array<unsigned int, 6>& indices
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): vertices(vertices), indices(indices) {}
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};
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struct plane {
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blt::vec4 plane;
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blt::vec3 color;
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};
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static std::unique_ptr<plane_model> createFlatPlane(const blt::vec4& plane, float scale) {
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// x + y + z + d = 0
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// 0 + n * y + 0 + d = 0
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// y = -d / n
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//blt::vec3 pointOnPlane{0, -plane.w() / plane.y(), 0};
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// x + y + z + d = 0
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// 0 + 0 + n * z + d = 0
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// z = -d / n
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//blt::vec3 other_pointOnPlane{0, 0, -plane.w() / plane.z()};
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//blt::vec3 vecOnPlane = (pointOnPlane - other_pointOnPlane).normalize();
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blt::vec3 normal {plane.x(), plane.y(), plane.z()};
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blt::vec3 tangent {};
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blt::vec3 bitangent {};
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blt::vec_algorithm::findOrthogonalBasis(normal, normal, tangent, bitangent);
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// project the tangent
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//blt::vec3 tangent = (vecOnPlane - normal * blt::vec3::dot(normal, vecOnPlane)).normalize();
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// construct the bitangnet
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//blt::vec3 bitangent = blt::vec3::cross(normal, tangent).normalize();
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// the tangent and the bitangent can be used to construct the plane vertices
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std::array<plane_vertex, 4> vertices = {
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blt_toVertex(-tangent * scale - bitangent * scale),
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blt_toVertex(tangent * scale - bitangent * scale),
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blt_toVertex(tangent * scale + bitangent * scale),
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blt_toVertex(-tangent * scale + bitangent * scale)
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};
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// x, y, z,
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// blt::vec3{scale, 0, scale}, // top vecOnPlane
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// blt::vec3{-scale, 0, scale}, // bottom vecOnPlane
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// blt::vec3{-scale, 0, -scale}, // bottom left
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// blt::vec3{scale, 0, -scale}, // top left
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std::array<unsigned int, 6> indices = {
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3, 1, 0,
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3, 2, 1
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};
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return std::make_unique<plane_model>(vertices, indices);
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}
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}
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#endif //FINALPROJECT_PLANES_H
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