Well I am not sure if you need custom controls or if the standard item shapes will work for you. If you need a ring, tetra, box, sphere etc then I would suggest using Item Shapes.
To add an item shape:
- Create a null
- Open up its properties §
- Under the geometry tab, click the Add Custom Object pull down and choose Item Shape
- Double click the Item Shape modifier and set the settings for shape etc to taste.
For a custom shape its a bit trickier. There is a script that will convert your objects in modeler to custom shapes that you can then load as a script. You can download the script here: http://www.chrisepeterson.com/ls/shapemaker.zip
To use this script:
- In modeler create the shape you want to use as a control
- Under the Utility menu, click the Lscript button
- Choose the shapemaker.ls
- Choose an output path to save its script shape.
- Go into Layout and add a null
- Open up its properties §
- Under the geometry tab, click the Add Custom Object pull down and choose Lscript
- Choose the shape script that you just created from modeler.
- You should now have a custom object shape
Hope that makes sense.
-Chris