Allow maximum number of particles to be configured.

src/fmri/visualisations.hpp

@@ -6,6 +6,20 @@
 #include "LayerInfo.hpp"
 
 namespace fmri {
+    /**
+     * Maximum number of interactions per layer.
+     *
+     * Controls the number of interactions per layer for performance
+     * reasons. Only the top INTERACTION_LIMIT interactions are shown
+     * to limit the amount of computations needed for animation.
+     *
+     * Note that this number currently applies only to InnerProduct
+     * type layers.
+     *
+     * This value is set from the options parser.
+     */
+    extern std::size_t INTERACTION_LIMIT;
+
     /**
      * Generate a static visualisation of a layer state.
      *