Tip 3. Because revit is so perfect in terms of measurement and objects touching each other, the revit engine can sometime read a whole number of panels that's front face is aligned as one single panel and not show up the joint lines, you need to force gaps if you want nicer renderings, to understand this, the best plan is to copy your model and play around with the copy, I generally add curtain wall mullions that are black paint, 1/4" or 1/2" wide and render it, after see the results I can determine if it is too much or too little. Below, render glass reads as one panel as there is no dark mullions
Tip 5. Any lights that are very close to glass panels should be turned down individually to avoid hot spotting, using the dimmer in the render dialogue box is the simplest method.
Tip 6. For external renderings it can be especially difficult to read glass planes if there are no lights turned on inside the building, it will look like dark black panels as oppose to glass (Picture 2, see top left), turn on some lights and bump them up 100 times to be visible with the external daytime render settings. Once the lights inside become visible you should put the on a medium setting to avoid hot spotting, reflection in external views is also quite important. See picture 3 for an example
Tip 7. Once you've mastered the external daytime render with lights turned on inside the building you can turn it into a night renders with one very simple step in Photoshop. Take the daytime rendering jpeg and cut the sky background out in Photoshop and replace it with a night time sky. Leave the building as it was (day time rendering), now you render looks like a night time shot. See (picture 4) below, this was a daytime rendering with the sky and foreground swapped out.