【图形学】树叶

1.绘制目标

树叶

【图形学】树叶_2d

2.核心代码

// 注意：纹理图像的位置，请根据你工程的实际路径设置！！！
  cv::Mat texture_img = loadImage("./Textures/bark_08.jpg", TEX_W, TEX_H);
  cv::Mat texture_img_GD = loadImage("./Textures/soil.jpg", TEX_W_GD, TEX_H_GD);
  cv::Mat texture_img_LF = loadImage("./Textures/leaf_05.png", TEX_W_LF, TEX_H_LF);

// 加载 图片纹理
    /// TO DO ///
    glBindTexture(GL_TEXTURE_2D, BARK_TEXTURE_ID);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, TEX_W, TEX_H, 0, GL_RGB, GL_UNSIGNED_BYTE, texture_img.data);
    glGenerateMipmap(GL_TEXTURE_2D);

    glBindTexture(GL_TEXTURE_2D, BARK_TEXTURE_ID_GD);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, TEX_W_GD, TEX_H_GD, 0, GL_RGB, GL_UNSIGNED_BYTE, texture_img_GD.data);
    glGenerateMipmap(GL_TEXTURE_2D);

    glBindTexture(GL_TEXTURE_2D, BARK_TEXTURE_ID_LF);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, TEX_W_LF, TEX_H_LF, 0, GL_RGB, GL_UNSIGNED_BYTE, texture_img_LF.data);
    glGenerateMipmap(GL_TEXTURE_2D);

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    cout << "Load the texture image successfully!" << endl;


// 注意：三维模型的路径，请根据你实际工程的路径正确设置！！！
  loadgroundmesh("./Meshes/Tree96-Ground.obj");
  loadbranchmesh("./Meshes/Tree96-Branch.obj");
  loadleafmesh("./Meshes/Tree96-Leaf.obj");


if (head == "v") { // 处理顶点坐标
        // TO DO: 获取顶点的X, Y, Z坐标并将其存入m_verts数组
        float v_x, v_y, v_z;
        iss >> v_x >> v_y >> v_z;
        m_verts.push_back(v_x);
        m_verts.push_back(v_y);
        m_verts.push_back(v_z);
      }
      else if (head == "vt") { // 处理纹理坐标
        // TO DO: 获取纹理的s, t坐标并将其存入m_textures数组
        float vt_x, vt_y, vt_z;
        iss >> vt_x >> vt_y >> vt_z;
        m_textures.push_back(vt_x);
        m_textures.push_back(vt_y);
        m_textures.push_back(vt_z);
      }
      else if (head == "vn") { // 处理法向量坐标
        // TO DO: 获取法向量的X, Y, Z坐标并将其存入m_normals数组
        float vn_x, vn_y, vn_z;
        iss >> vn_x >> vn_y >> vn_z;
        m_normals.push_back(vn_x);
        m_normals.push_back(vn_y);
        m_normals.push_back(vn_z);
      }


if (head == "v") { // 处理顶点坐标
        // TO DO: 获取顶点的X, Y, Z坐标并将其存入m_verts数组
        float v_x, v_y, v_z;
        iss >> v_x >> v_y >> v_z;
        m_verts.push_back(v_x);
        m_verts.push_back(v_y);
        m_verts.push_back(v_z);
      }
      else if (head == "vt") { // 处理纹理坐标
        // TO DO: 获取纹理的s, t坐标并将其存入m_textures数组
        float vt_x, vt_y, vt_z;
        iss >> vt_x >> vt_y;
        m_textures.push_back(vt_x);
        m_textures.push_back(vt_y);
      }
      else if (head == "vn") { // 处理法向量坐标
        // TO DO: 获取法向量的X, Y, Z坐标并将其存入m_normals数组
        float vn_x, vn_y, vn_z;
        iss >> vn_x >> vn_y >> vn_z;
        m_normals.push_back(vn_x);
        m_normals.push_back(vn_y);
        m_normals.push_back(vn_z);
      }


void ObjFileLoader::get_vertex_at(unsigned int id, float* vertexCoords) {
  assert(id >= 0 && id < m_verts.size());

  // TO DO: 请从m_verts获取指定id处的X, Y, Z坐标并将其写入vertexCoords数组中
  vertexCoords[0] = m_verts.at(id * 3);
  vertexCoords[1] = m_verts.at(id * 3 + 1);
  vertexCoords[2] = m_verts.at(id * 3 + 2);
}

void ObjFileLoader::get_texture_at(unsigned int id, float* textureCoords) {
  assert(id >= 0 && id < m_textures.size());

  // TO DO: 请从m_textures获取指定id处的s, t坐标并将其写入textureCoords数组中
  textureCoords[0] = m_textures.at(id * 2);
  textureCoords[1] = m_textures.at(id * 2 + 1);
}

void ObjFileLoader::get_normal_at(unsigned int id, float* normalVector)
{
  assert(id >= 0 && id < m_normals.size());

  // TO DO: 请从m_verts获取指定id处的X, Y, Z坐标并将其写入vertexCoords数组中
  normalVector[0] = m_normals.at(id * 3);
  normalVector[1] = m_normals.at(id * 3 + 1);
  normalVector[2] = m_normals.at(id * 3 + 2);
}

3.运行结果

【图形学】树叶_2d_02


【图形学】树叶_纹理图像_03