92 lines
3.5 KiB
C
92 lines
3.5 KiB
C
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/*
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* Created by Brett Terpstra 6920201 on 17/10/22.
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* Copyright (c) 2022 Brett Terpstra. All Rights Reserved.
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*/
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#ifndef STEP_2_MODELS_H
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#define STEP_2_MODELS_H
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#include "std.h"
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#include "engine/math/vectors.h"
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#include "engine/math/colliders.h"
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#include "engine/math/bvh.h"
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namespace Raytracing {
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struct ModelData {
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public:
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// storing all this data is memory inefficient
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// since normals and vertices are only vec3s
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// and uvs are vec2s
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// TODO: create lower order vector classes
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std::vector<Vec4> vertices;
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std::vector<Vec4> uvs;
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std::vector<Vec4> normals;
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std::vector<face> faces;
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AABB aabb;
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std::vector<Triangle> toTriangles() {
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std::vector<Triangle> triangles;
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PRECISION_TYPE minX = infinity, minY = infinity, minZ = infinity, maxX = ninfinity, maxY = ninfinity, maxZ = ninfinity;
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for (face f: faces) {
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Triangle t {vertices[f.v1], vertices[f.v2], vertices[f.v3],
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uvs[f.uv1], uvs[f.uv2], uvs[f.uv3],
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normals[f.n1], normals[f.n2], normals[f.n3]};
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PRECISION_TYPE tMinX = infinity, tMinY = infinity, tMinZ = infinity, tMaxX = ninfinity, tMaxY = ninfinity, tMaxZ = ninfinity;
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// find the min and max of all the triangles
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tMinX = std::min(t.vertex1.x(), std::min(t.vertex2.x(), std::min(t.vertex3.x(), tMinX)));
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tMinY = std::min(t.vertex1.y(), std::min(t.vertex2.y(), std::min(t.vertex3.y(), tMinY)));
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tMinZ = std::min(t.vertex1.z(), std::min(t.vertex2.z(), std::min(t.vertex3.z(), tMinZ)));
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tMaxX = std::max(t.vertex1.x(), std::max(t.vertex2.x(), std::max(t.vertex3.x(), tMaxX)));
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tMaxY = std::max(t.vertex1.y(), std::max(t.vertex2.y(), std::max(t.vertex3.y(), tMaxY)));
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tMaxZ = std::max(t.vertex1.z(), std::max(t.vertex2.z(), std::max(t.vertex3.z(), tMaxZ)));
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// create a AABB for model local BVH
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t.aabb = {tMinX, tMinY, tMinZ, tMaxX, tMaxY, tMaxZ};
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// and of course for a model AABB,
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minX = std::min(tMinX, minX);
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minY = std::min(tMinY, minY);
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minZ = std::min(tMinZ, minZ);
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maxX = std::max(tMaxX, maxX);
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maxY = std::max(tMaxY, maxY);
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maxZ = std::max(tMaxZ, maxZ);
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triangles.push_back(t);
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}
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// to generate a AABB
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aabb = {minX, minY, minZ, maxX, maxY, maxZ};
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return triangles;
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}
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// creates a BVH tree and returns the list of objects we created. make sure to delete them.
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static std::vector<Object*> createBVHTree(std::vector<Triangle>& triangles, const Vec4& pos) {
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std::vector<Object*> objects;
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for (auto& tri : triangles){
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Object* obj = new EmptyObject(pos, tri.aabb, tri);
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objects.push_back(obj);
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}
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return objects;
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}
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};
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class ModelLoader {
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private:
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public:
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virtual ModelData loadModel(std::string file) = 0;
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};
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class OBJLoader : public ModelLoader {
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private:
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public:
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virtual ModelData loadModel(std::string file);
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};
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}
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#endif //STEP_2_MODELS_H
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