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我正在渲染一个圆锥体,我想将它旋转,逆时针旋转90度,这样尖端朝西!我正在使用OpenGL 3+.

到目前为止,这是我在Cone.cpp中的代码:

//PROJECTION
    glm::mat4 Projection = glm::perspective(45.0f, 1.0f, 0.1f, 100.0f);

    //VIEW
    glm::mat4 View = glm::mat4(1.);
    View = glm::translate(View, glm::vec3(2.0f,4.0f, -25.0f));

    //MODEL
    glm::mat4 Model = glm::mat4(1.0);
    //Scale by factor 0.5
    Model = glm::scale(glm::mat4(1.0f),glm::vec3(0.5f));

    glm::mat4 MVP = Projection * View * Model;
    glUniformMatrix4fv(glGetUniformLocation(shaderprogram_spaceship, "MVP_matrix"), 1, GL_FALSE, glm::value_ptr(MVP));

    glClearColor(0.0, 0.0, 0.0, 1.0);

    glDrawArrays(GL_LINE_STRIP, start_cone, end_cone );

并非所有代码都显示出来.

有人可以指导我完成轮换吗？我必须将View矩阵相乘吗？用"glm旋转"功能？