【毕业设计】基于程序化生成和音频检测的生态仿真与3D内容生成系统----程序化生成地形算法设计

news/2024/11/25 1:01:22/

2 程序化生成地形算法设计

2.1 地形曲线的生成

2.1.1 初始化高度场

struct Make2DGridPrimitive : INode {virtual void apply() override {size_t nx = get_input<NumericObject>("nx")->get<int>();nx = std::max(nx, (size_t)1);size_t ny = has_input("ny") ?makepositive(get_input<NumericObject>("ny")->get<int>()) : 0;if (!ny) ny = nx;float dx = 1.f / std::max(nx - 1, (size_t)1);float dy = 1.f / std::max(ny - 1, (size_t)1);vec3f ax = has_input("sizeX") ?get_input<NumericObject>("sizeX")->get<vec3f>(): vec3f(1, 0, 0);vec3f ay = has_input("sizeY") ?get_input<NumericObject>("sizeY")->get<vec3f>(): vec3f(0, 1, 0);vec3f o = has_input("origin") ?get_input<NumericObject>("origin")->get<vec3f>() : vec3f(0);if (has_input("scale")) {auto obj = get_input<NumericObject>("scale");auto scale = obj->is<int>() ? obj->get<int>() : obj->get<float>();ax *= scale;ay *= scale;}auto dir = get_param<std::string>("Direction");if(dir == "YZ"){ax = zeno::vec3f(0,ax[0],0);ay = zeno::vec3f(0, 0, ay[1]);}if(dir == "XZ"){ay = zeno::vec3f(0,0,ay[1]);}if (get_param<bool>("isCentered"))o -= (ax + ay) / 2;ax *= dx; ay *= dy;auto prim = std::make_shared<PrimitiveObject>();prim->resize(nx * ny);auto &pos = prim->add_attr<vec3f>("pos");
#pragma omp parallel for collapse(2)for (intptr_t y = 0; y < ny; y++) for (intptr_t x = 0; x < nx; x++) {intptr_t index = y * nx + x;vec3f p = o + x * ax + y * ay;size_t i = x + y * nx;pos[i] = p;}if (get_param<bool>("hasFaces")) {prim->tris.resize((nx - 1) * (ny - 1) * 2);
#pragma omp parallel for collapse(2)for (intptr_t y = 0; y < ny-1; y++) for (intptr_t x = 0; x < nx-1; x++) {intptr_t index = y * (nx - 1) + x;prim->tris[index * 2][2] = y * nx + x;prim->tris[index * 2][1] = y * nx + x + 1;prim->tris[index * 2][0] = (y + 1) * nx + x + 1;prim->tris[index * 2 + 1][2] = (y + 1) * nx + x + 1;prim->tris[index * 2 + 1][1] = (y + 1) * nx + x;prim->tris[index * 2 + 1][0] = y * nx + x;}}prim->userData().set("nx", std::make_shared<NumericObject>((int)nx));//zhxxprim->userData().set("ny", std::make_shared<NumericObject>((int)ny));//zhxxset_output("prim", std::move(prim));}
};ZENDEFNODE(Make2DGridPrimitive,{ /* inputs: */ {{"int", "nx", "2"},{"int", "ny", "0"},{"vec3f", "sizeX", "1,0,0"},{"vec3f", "sizeY", "0,1,0"},{"float", "scale", "1"},{"vec3f", "origin", "0,0,0"},}, /* outputs: */ {{"PrimitiveObject", "prim"},}, /* params: */ {{"enum XZ XY YZ", "Direction", "XZ"}, // zhxxhappy{"bool", "isCentered", "0"},{"bool", "hasFaces", "1"},}, /* category: */ {"primitive",}});

2.1.2 原始几何体投影到高度场

2.1.3 创建低精度版的高度场

2.1.4 把造型采样到低精度高度场，并做平滑处理

2.1.5 平滑后的数据采样回高精度的高度场

2.2 地形变形处理

2.2.1 Curl Noise 变形处理

2.2.2 整体 Hybrid Noise 变形

2.2.3 初始化地形数据，并标记边界，为侵蚀处理做谁备

2.3 地形侵蚀

2.3.1 地表稳固

2.3.2 热侵蚀

2.3.3 崩塌