Question

Im new to iPhone game development, can you please explain about the GLKMatrix4 in OpenGL.
please any one help me.

Thanks in Advance.

Answer 1

From Apple’s doc:

The GKLMatrix4 type defines a 4×4 floating-point matrix as well as
many mathematical operations commonly used to manipulate matrices.
OpenGL ES uses matrices extensively as a convenient way to represent a
graphical transformation between different coordinate systems. These
transformations include translation, scaling, rotation and projection;
through matrix multiplication, multiple transformations can be
concatenated into a single transformation matrix.

The functions that manipulate GKLMatrix4 structures treat the inputs
as immutable, instead returning a new matrix that represent the
results of the operation.

Matrices in 3D programming are most commonly used for transformations: moving, rotating, scaling, etc. your objects in the 3D scene, calculate the viewport of a camera, and so on. If this sounds you somehow blur try to read some introduction to 3D programming like this one (this is specific for OpenGL ES for your convenience): http://iphonedevelopment.blogspot.it/2009/05/opengl-es-from-ground-up-table-of.html
Especially Chapter 7 you might find useful.