Drone Grid Case Study: Creating the Player - Beginning Android 3D Game Development - page 221

The constructor for the Object3d class must also be modified to account for the addition of the new
Mesh variable. See changes in bold in Listing 7-3.
Listing 7-3. Object3d Constructor
Object3d(Context iContext , Mesh iMesh , MeshEx iMeshEx, Texture[] iTextures, Material iMaterial,
Shader iShader)
{
m_Context = iContext;
m_Mesh = iMesh;
// REst of Code
}
The GetRadius() function is modified to return the radius of the object's m_Mesh variable, if it exists.
(See Listing 7-4.) The object's mesh can now be held in either a Mesh or a MeshEx.
Listing 7-4. GetRadius() Function Modifications
float GetRadius()
{
if (m_Mesh != null)
{
return m_Mesh.GetRadius();
}
if (m_MeshEx != null)
{
return m_MeshEx.GetRadius();
}
return -1;
}
The DrawObject() function, which draws the actual object's mesh, is modified to test to see if the
m_Mesh variable contains a valid object. If it does, the Mesh's DrawMesh() function is called to do the
actual rendering of the object. (See Listing 7-5.)
Listing 7-5. Modifying the DrawObject() Function
void DrawObject(Camera Cam,PointLight light,Vector3 iPosition,Vector3 iRotationAxis,Vector3 iScale)
{
// Activate and set up the Shader and Draw Object's mesh
// Generate Needed Matrices for Object
GenerateMatrices(Cam, iPosition,iRotationAxis,iScale);
// Add program to OpenGL environment
m_Shader.ActivateShader();
// Get Vertex Attribute Info in preparation for drawing the mesh
GetVertexAttribInfo();