Surface Seam and material render

I’m a part time user of Rhino for Mac, (I use it to model basic furniture/lighting for my professional practice). recently I’ve been sharpening some of my very basis skills and learning to model better in Rhino. I have been modelling an organic form, a ‘fat penguin’, which I may get a pattern made and then cast some pieces in solid brass etc. Having a quick look at my model with the renderer I noticed that if I used a material which I had imported from my library the seam showed ? If I applied a material from the pre-installed ones the seam doesn’t show ? Have I missed something in the way I have created my surfaces ? Or is there something in the render settings etc ?
My workflow was, picture frames , control point curves, cross section profiles, curve network
Images attached of the 2 examples

It looks like the one with the seam is using a bitmap for the texture. I’m guessing it’s not a seamless bitmap and that’s why you are seeing the seam. You could swap it out for a seamless texture or adjust the texture mapping in rhino to hide the seam.

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thanks @okeating , yes the surfaces and model seem fine, it’s a valid closed polysurface, how do I get a ‘seamless bitmap’ ? And adjusting the texture mapping is new to me, I’ll search out a topic or tutorial on this, cheers

You need to either find a seamless bitmap or edit the one you are using in photoshop or some such. It basically means that the pixels on the left side of the image match those on the right side so when you tile them the seams are not visible. Adjusting the texture mapping is probably quicker and means you can use the existing map.

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@okeating Owen, yes I’ve just done my own in photoshop, quite simple really, also found a website for more complicated materials too, many thanks for the input, I’ll look into texture mapping too, cheers