Steph, but the curve is there, or am I looking at different images to everyone else
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A point to remember is this is a CAD render and has probably been done with limited shadow or occlusion rendering, both of which drive up the render time and image size. Whenever I did renders you just did a quick once or twice shadow pass for web work and maybe a full blown studio shadow pass for promotion shot, way back then that would take hours and I mean leave the PC overnight kind of hours for one rendered image.
Limited shadow runs cut back the shadow effect, it's depth and definition so there may well be a perfect curve across the windscreens, just that the render is not showing it fully. If you look at the top of the side window at that darker line, that'll be the shadow from the curved body sections, look at each end and you'll see it's a bit lumpy, a reasonable sign that a quick shadow render has been done.
Also bear in mind the over thick windscreen surround, whatever lip there is under the curved section will be covered up by the slightly over thick surround.
I can see they are there, but concede they are not that visible for what I think are two reasons, the thick windscreen surround and a quick shadow render. Check out the other window surrounds, they are all just a little too thick, even the body side ones which in reality are pretty slim. Being a CAD image means these can be adjusted at will and will only take a few seconds to trim back.
I'm not defending the model, just know first hand how easy it is for a render to throw things out, or taken the other way, to hide or mislead, this is a computer image and as such can be manipulated at will to give any effect you want
Likewise, I agree on the DJH, probably the best shaped 47 cab in the business in any scale.