There are many ways to take an object appart. In this example it will be made invisible over time by using an animated bool, while at the same time particles are created on the border of the bool.
To achieve this you will need one real obect for the bool and another slightly larger to determine the collision area. One is animated, the other will be controled via Xpresso to follow the first.
The Collision node in Xpresso allows for the use of selection tags. These selection tags are updated for each frame and contain the polygons currently colliding. To create a smooth effect the colliding surfaces need to be a bit higher subdivided so the selection can cover the outline of the to be dessolved object adequately.
By using the same polygon selection for material assignment the not colliding polygons will be made transparent and the others get a strong glow to cover the actual bool. Depending on your needs you might make the selection invisible too and just create particles.
To create the particles a TP Polygon Emitter is used which supports the use of polygon selection.
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