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The photorealism if your gallery is amazing!
Actually - I was just wondering if there'd be mach diamonds if the exhaust stream is in a vacuum, since I thought mach diamonds were related to the speed of sound
Neat idea to change Mars to look more appropriate to the era
The shock diamonds are a bit of a cheat, I suppose, because I add them in post, with Photoshop. But I think they end up looking pretty good. They're pretty easy--make a new photoshop file thats fairly long and thin. Make visible the grid, and use a hard, square brush to lay down a single white or near-white square. Rotate the square 45º, then use distort to elongate it a little into a more diamond shape. Then use filter-Gaussian blur, and blur enough to soften the hard edges. Then use the grid to duplicate your diamond at regular intervals. In a new layer you can use a soft brush at 40% opacity or so to connect the diamonds with a hot core. At this point you can crate another new layer and create a tapering outer thrust area, also hazy. If it looks too solid, hit it with some gaussian blur. I usually rearrange this layer to be below the shock diamonds. Then, merge visible, copy the whole thing, bring it into your main file, and use rotate to get it going in the right direction, and scale. If needed, like in this image, use the perspective distort. Then just fine adjust, and mask as appropriate.
Hope this helps, if you have any troubles, just let me know, and I'll see if I can help out.