The Path Data Tag
This tag is used in conjunction with the Follow Path modifier. For details of how the tag is used, please see the Follow Path modifier page. It allows you to set different parameters for one or more of the path objects if you need different settings for a particular object. The tag is not required for routine use of the Follow Path modifier, only if you need a different setting for an object.
The tag's interface looks like this:
For the buttons at the bottom of the interface, please see the 'Common interface elements' page.
Acuteness of Turn
This value controls how sharply the particle will turn to head for the object the tag is applied to. If it is too low, the particle may not reach the object in time, in which case it will circle back to try again. This setting is used if in the Follow Path modifier the 'Get AOT From' parameter is set to 'Tag'.
The speed with which the particle will move to the object the tag is applied to. This setting is used if in the Follow Path modifier the 'Speed Mode' parameter is set to 'Get Speed From Tag' or 'Increment Speed From Tag'.
Adjust Speed By Distance
When the particle stream turns to point to the next path object, they will all move at the same speed but particles on the outside of the curve will take longer to get there than those on the inside. Checking this switch will reduce that discrepancy by adjusting the speed to take account of the distance to be travelled. This setting is used if in the Follow Path modifier the 'Speed Mode' parameter is set to 'Get Speed From Tag' or 'Increment Speed From Tag'.
When a particle stream moves from one path object to another, the Follow Path modifier tries to send each particle to the same relative position in the next object, to avoid excessive distortion of the particle stream. In many cases this works very well, but if the next path object is very different in shape or size from the previous one, it may not be so successful. If that happens, add this tag to the next object and check 'Force Recalculate'. This will force the modifier to find a new position in the next path object, but at the cost of some twisting to the particle stream.