OpenGL: 世界球体（移动，公转，自转）

image.png

void SetupRC()

1. 绘制地板

很多个矩形组成

   //绘制地板
   floorBatch.Begin(GL_LINES, 300);
   for (GLfloat x = -30; x <= 30; x += 0.5) {
       floorBatch.Vertex3f(x, -0.55f, 30.0f);
       floorBatch.Vertex3f(x, -0.55f, -30.0f);

       floorBatch.Vertex3f(30.0f, -0.55f, x);
       floorBatch.Vertex3f(-30.0f, -0.55f, x);

   }
   floorBatch.End();

2. 绘制花托

void gltMakeTorus(GLTriangleBatch& torusBatch, GLfloat majorRadius, GLfloat minorRadius, GLint numMajor, GLint numMinor)

//绘制花托
   gltMakeTorus(torusBatch, 0.4f, 0.15f, 30, 30);

3. 绘制球体

   //绘制球体
   gltMakeSphere(sphereBatch, 0.1f, 26, 13);

void RenderScene(void)
花托自转

    modelViewMatrix.Rotate(yRot, 0.0f, 1.0f, 0.0f);

    //绘制花托
    shaderManager.UseStockShader(GLT_SHADER_FLAT,transformPipeline.GetModelViewProjectionMatrix(),vTorusColor);
    torusBatch.Draw();

球体公转

   //绘制公转
    modelViewMatrix.Rotate(yRot * -0.2f, 0.0f, 1.0f, 0.0f);
    modelViewMatrix.Translate(0.8f, 0.0f, 0.0f);
    shaderManager.UseStockShader(GLT_SHADER_FLAT,transformPipeline.GetModelViewProjectionMatrix(),vSphereColor);
    sphereBatch.Draw();

世界坐标系移动

void SpecialKeys(int key,int x,int y)
{

    float linar = 0.1f;
    float angular = float(m3dDegToRad(0.5f));

    if (key == GLUT_KEY_UP) {
        cameraFrame.MoveForward(linar);
    }
    else if(key == GLUT_KEY_DOWN){
        cameraFrame.MoveForward(-linar);
    }
    else if(key == GLUT_KEY_LEFT){
        cameraFrame.RotateWorld(angular, 0.0f, 1.0f, 0.0f);
    }
    else if(key == GLUT_KEY_RIGHT){
        cameraFrame.RotateWorld(-angular, 0.0f, 1.0f, 0.0f);
    }

}

代码：GitHub：(稍后上传)