Bullet physics integrated in a real photo

Particles were separated from particles system (using ctrl-shift-a) then integrated in a real photo...

And now with coins bouncing on the table:

Bouncing is exagerated to give a splash effect on the table.

Rigid bodies collision boxes are UV mapped using project from view.

Scene is not realistic anyway but it is more a demo on what can be done using the rigid body feature in Blender 2.68.

Money dream

Using Blender 2.68 with particles system for coins.

Money Money Money - 400 € in 10 seconds with Blender

Using blender particles system with 200 particles. Coins bouncing is made by using a plane (not rendered) with collision properties. Particules rotation, random velocity and brownian force are set to the particules system.

The only problem is that particle system do not support collision between particules. So coins may appear as if they were mixed up... Any solution?

How to add compositing nodes to a single object using pass index (without multiple renderlayers)

Sometimes you want to add only compositing nodes to specific objects in your scene.
The most common way to do this is to use multiples renderlayers. Anyway, this method is quite long and implies long calculation times as new layers have to be rendered individually.

Another usefull way is using the pass index settings:

1- Select the object on which you want to add composite nodes. In "Relations", set the "Pass Index" from 0 to 1. This index will identify the object in the Node Editor.

2- In the RenderLayers tab / Passes, check the Object index box:

3- Open the Node Editor and add the following nodes as depicted below:

 The ID Mask purpose is to filter the object pass index you entered at step 1. Then by mixing the RenderLayer image with a black image and applying the alpha output from the ID Mask node to the Fac input of the mixing node, you get only your object on a black background. A Chroma Key node can then be used as well to add a transparency mask.

Here is a quick video to show you how to blur a single cube in a scene with multiple objects:

Hope this is usefull.

Rotating rings with Cycles - 10 rings around a metal sphere

First rendering with Cycles.
400 Samples and 24 hours calculation time.

With some compositing (glare and blur for the sphere) :

Now full animation with compositing (glaring sphere). Rendered with 100 samples only so quality is quite bad. Soundtrack added as well (youtube audio):