Drivers UI: Debug Info

Feature request for ZanQdo, which shows the intermediate values used in driver calculations (i.e. current value of driver, and current value of variables), allowing drivers expressions to be debugged. This is a per-driver setting...

1 files changed, 6 insertions, 3 deletions

diff --git a/source/blender/blenkernel/intern/fcurve.c b/source/blender/blenkernel/intern/fcurve.c
index 3ce77c8cb4f..60d670e5f71 100644
--- a/source/blender/blenkernel/intern/fcurve.c
+++ b/source/blender/blenkernel/intern/fcurve.c
@@ -1237,14 +1237,17 @@ float driver_get_variable_value (ChannelDriver *driver, DriverVar *dvar)
 		return 0.0f;
 	
 	/* call the relevant callbacks to get the variable value 
-	 * using the variable type info
+	 * using the variable type info, storing the obtained value
+	 * in dvar->curval so that drivers can be debugged
 	 */
 	dvti= get_dvar_typeinfo(dvar->type);
 	
 	if (dvti && dvti->get_value)
-		return dvti->get_value(driver, dvar);
+		dvar->curval= dvti->get_value(driver, dvar);
 	else
-		return 0.0f;
+		dvar->curval= 0.0f;
+	
+	return dvar->curval;
 }
 
 /* Evaluate an Channel-Driver to get a 'time' value to use instead of "evaltime"