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enter image description here

I want to achieve that light glowing effect. What material and what nodes do I have to use?

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There is a simple way to create a glow effect in Cycles.

  1. Add a cube.

  2. In the material section, Choose "Transparent BSDF" or "Glass BSDF" as the surface and the colour of your choice.

  3. Select "Emission" in the volume and choose the colour as white.The strength can be of your choice

enter image description here

  1. Add a place below the cube

  2. Add another cube and scale it up slightly by pressing S and dragging the pointer.

  3. Make the colour of the cube black and choose the surface to be "Emission"

  4. Go to modifiers, chose wireframe, edit the thickness to your liking.

enter image description here

  1. Place the wireframe over the cube and then Render.It should look similar to the example below:

enter image description here

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    $\begingroup$ Nice first answer. Welcome to the site. $\endgroup$ – David Mar 10 '18 at 13:12
  • $\begingroup$ Good answer. However, using Transluscent BSDF is more better for me. $\endgroup$ – Black Thunder Aug 18 at 9:47
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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'.

Compositor for Fog Glow

Final Result

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'.

Final result with cage

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  • $\begingroup$ @ rich thanks for trying but it did not look much realistic as in the picture $\endgroup$ – atek Nov 10 '16 at 11:03
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    $\begingroup$ @atek I expect that a lot more work went into the reference picture than could be expected for an answer here. There are all kinds of methods to make it look more realistic - as adding textures, irregularities, bump maps, etc. You need to get whatever hints and ideas you can from here and then spend some time getting to grips with it and applying it to your specific case. Different methods are suitable for different situations - for example, a technique for generating a photorealistic image won't be necessarily practical for use in a game engine or animation where render time is a priority. $\endgroup$ – Rich Sedman Nov 10 '16 at 11:21
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While Rich Sedmans shader is very interesting and advanced, the most simple solution is to just use a Translucent BSDF for the box and add a light source inside. The Fog glow thing in the compositor stays is the same. enter image description here

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  • $\begingroup$ @ simon thanks can u show me full nodes or this 2 nodes show in the image are sufficient as im weak in the nodes and to the sphere inside the cube how much or what material i have to give plz mention $\endgroup$ – atek Nov 10 '16 at 11:07
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    $\begingroup$ Dude no offense but you seriously need to learn some of this by yourself. This is the most simple shader possible. A Transluent Shader that is directly connected to the Material Output as clearly shown with the line between them. There is nothing else in this shader. $\endgroup$ – Simon S. Nov 10 '16 at 11:09
  • $\begingroup$ I started Blender just a few days ago with no previous experience with any other 3D applications, and even I could easily do this. Even the concept is easy, just like in real life. $\endgroup$ – Damn Vegetables Dec 21 '18 at 5:36

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