I am looking for old looking cracked glass for a window in a shack scene. I have looked everywhere but can find a tutorial or material or model on this
please can someone help me on this
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Here, try this:
As Eric pointed out in the comments, the secret here is a Voronai texture set to "distance to edge". I used ColorRamps to remove all the grayscale and leave only black outlines. I made a large, medium, and small set of cracks and mixed them together. I then used this combo as a main image (BaseColor), as a basis for a normal map, and I also inverted it to make an alpha mask.
Final result looks like this:
This can obviously be made better by creating more distortion among the cracks, but I feel this is a good place to start. I'll upload the .blend file so you can experiment.
Hope this helps.