Help on the X-ray Diffraction of polycrystal

[songpeixuan22]

Hello, I wonder if there is a method of self-defining the percentage of the grain in the crystal, and simulating the forward model of XRD？

[kklmn]

Hi,
Please define "the grain in the crystal" and "the forward model of XRD".

[songpeixuan22]

Sorry for the vague expression.
My problem is that I don't know how to define the density distribution of single crystal face(around fiber texture axis) in spherical coordinates,
and to simulate the XRD plot on the screen when the crystal is exposed to a direct beam of X-ray.