The Question object determines when to carry out one or more actions which are present in the Question object's Actions list.

It can also be used to activate or deactivate modifiers.

This page will give you an explanation of its general use, together with some specific examples; a more detailed page will come in later waves.

You can only add a Question object to the scene by clicking the Add Question button in the xpEmitter’s Questions tab.

This adds the Question object to the scene and inserts it into the emitter’s Questions list.

Particle Age Question object, having been added to the Questions list.

Once that is done, you can also drag the Question object into the Questions list of any other emitter in the scene, if required.

You can also duplicate the object and change the copy to a completely different question.

Each question has at least one parameter and sometimes a list of conditions.

These conditions would include tests such as whether the particle value is less than or greater than the value you specify.

Here, the question conditions are established, with Mode set to Is Less Than, with an Age value of 30 frames.

The particle is compared to the value you give and, if the conditions are satisfied, the question is said to have ‘passed’ and any action or actions listed in the question are carried out on the particle.

If the conditions are not satisfied the question is said to have ‘failed’ and the action is not carried out.

The parameters depend on what kind of question it is so the interface will vary.