I want to achieve that light glowing effect. What material and what nodes do I have to use?
There is a simple way to create a glow effect in Cycles.
Add a cube.
In the material section, Choose "Transparent BSDF" or "Glass BSDF" as the surface and the colour of your choice.
- Select "Emission" in the volume and choose the colour as white.The strength can be of your choice
Add a place below the cube
Add another cube and scale it up slightly by pressing S and dragging the pointer.
Make the colour of the cube black and choose the surface to be "Emission"
- Go to modifiers, chose wireframe, edit the thickness to your liking.
- Place the wireframe over the cube and then Render.It should look similar to the example below:
Assuming Cycles, you can do something like the following :
Create a cube and set up a material similar to that described in this answer to generate the variation of warm glow of the centre of the cube.
Activate Freestyle and adjust the line width for the thickness of the lines.
Use the compositor to add a 'fog glow'.
For a more convincing result, rather than using Freestyle you could model the cage around the light using a separate mesh so that it has some actual geometry (rather than being simple, flat, automatically generated lines). An easy way to generate such a cage is similar to this answer to Duplicate the object (AltD), go into Edit mode on the duplicate, select all with A, press X and select Only Faces. Come out of 'Edit' mode and add a Skin modifier. You can adjust the size of the skin by varying the Vertex Radius (Alt-A) while vertices are selected. Assign a suitable material to the 'cage'.