Drawing 3D geometric primitives

In this recipe, we will learn how to draw the following 3D geometric shapes:

• Cube

• Sphere

• Line

• Torus

• Cylinder

Getting ready

Include the necessary header to draw in OpenGL using Cinder commands and statements. Add the following code to the top of your source file:

#include "cinder/gl/gl.h"
#include "cinder/Camera.h"

using namespace ci;

How to do it…

We will create several geometric primitives using Cinder's methods for drawing in 3D.

1. Declare the member variables with information of our primitives:

   Vec3f mCubePos, mCubeSize;
   Vec3f mSphereCenter;
   float mSphereRadius; 
   Vec3f mLineBegin, mLineEnd; 
   Vec3f mTorusPos;
   float mTorusOuterRadius, mTorusInnerRadius; 
   Vec3f mCylinderPos;
   float mCylinderBaseRadius, mCylinderTopRadius, mCylinderHeight;

2. Initialize the member variables with the position and sizes of the geometry. Add the following code in the setup method:

   mCubePos = Vec3f( 100.0f, 300.0f, 100.0f );
   mCubeSize = Vec3f( 100.0f, 100.0f, 100.0f );
   
   mSphereCenter = Vec3f( 500...