So I was playing around with Uv's lately... if you try to merge objects that have their UV's on seperate UV maps, it causes this crazy. My solution was copying my UV's to a single map then merging the objects. I've also come to a complete frustration that working with multiple UV's for multiple objects in Maya is a…
Spikes... forgive me if this is too basic, but are you deleting your history on those models frequently? I usually see UVs go haywire like that when an object has an extensive construction history. Shading/ripples... This looks like a clipping issue on your perspective camera. Go to view > select camera in your perspective…