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Separate your shadows and GI/AO layers within the compositor to adjust their colours: By default in Blender, shadows and GI are black. This doesn’t always give the best result. If you look at Pixar’s work, for example, the shadow is usually a darker, more saturated version of the diffuse colour. You can achieve this effect in the compositor by specifying your layer to output a separate GI and shadow pass. Use the Mix node set to multiply your shadow/GI with a colour of choice, them Mix that back into your render pass for best effect. We sometimes render a scene (Scene01) with no GI or shadows at all, and an identical copy of that same scene (Scene02) to get just the GI and shadows layers by themselves. Use the compositor back in Scene01 to composite those layers from Scene02, using the colour picker inside the Mix node set to Multiply or Add to achieve the shadow colour we need.
I am a big fan of the node based compositor in Blender, but I always get annoyed by how slow it is. This makes comparing two different outputs in the node tree practically impossible. Fortunately there is a solution: The split viewer. This node replaces the default viewer and has two input sockets that are displayed next to each other. To see them you need to enable the backdrop in the top right corner of the compositor. I use it all the time when post processing my renders.
Edge loops are incredible lifesavers for the same reasons above. They also make working with your model intelligently and efficiently really easy. Instead of grabbing an entire loop of faces one by one, you can select them all simultaneously and modify them together. To select all the vertices, edges, or faces in a mesh loop, click on any member of the family while holding Alt. It’s really easy to use the Knife tool to trace over a reference image or even another mesh or curve. For extremely complex patterns or anything else that you’d like to bring to life, however, the Knife Project tool can do some of the heavy lifting for you. To use Knife Project, you’ll need two things: your target mesh, and a mesh of the pattern, shape, text, or design that you would like to project onto it. This has to be a mesh, not just an image—you can import an SVG file into Blender and convert it to a mesh with the SVG Importer add-on enabled, however.
You can create and render vastly more complex scenes by using [Alt]+[D] instead of [Shift]+[D] to duplicate an object. The new object will share the same mesh data as the original, reducing memory usage. Even better, any changes made to one object will also be applied to the others, enabling you to update hundreds of objects at once. When you can get away with it, avoid UV mapping by using a quick-and-dirty flat projection on basic geometry. You can create complex, realistic objects in minutes. In most cases, the result will still look the same from a distance. Find extra info on https://3darts.org/.