tadd precaution on instabilities with backwards finite differences - slidergrid - grid of elastic sliders on a frictional surface
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       ---
 (DIR) commit c3e0b8d528cae8ad2e8b04ff4ea49ca565c50504
 (DIR) parent 2c8a1eb434b536ba5a6bd764c8a40ff975e78a97
 (HTM) Author: Anders Damsgaard <anders.damsgaard@geo.au.dk>
       Date:   Wed, 23 Mar 2016 12:13:49 -0700
       
       add precaution on instabilities with backwards finite differences
       
       Diffstat:
         M slidergrid/slider.c                 |       1 +
       
       1 file changed, 1 insertion(+), 0 deletions(-)
       ---
 (DIR) diff --git a/slidergrid/slider.c b/slidergrid/slider.c
       t@@ -162,6 +162,7 @@ void slider_displacement(slider* s1, const slider s2,
                    subtract_float3(dist_future, dist0), 2.0);
        
            // Get displacement change from previous and current inter-slider distance
       +    // this can cause instabilities when only elasticity is included
            //const Float3 ddist = subtract_float3(dist, dist0);
        
            //if (iteration == 0)