diff --git a/isotest/bits/generic_processor.v b/isotest/bits/generic_processor.v
index 467c24f..3e47415 100644
--- a/isotest/bits/generic_processor.v
+++ b/isotest/bits/generic_processor.v
@@ -28,6 +28,9 @@ fn (gpc &GenericCrusherProcessor) process(ob &Object) {
 
 		//crush_stone_object(ob)
 		crush_stone_object2(ob)
+		crush_stone_object2_part(ob, ob.stone_part)
+		crush_stone_object_part(ob)
+		crush_object_part(ob, "stone")
 		
 		println("> create sand")
 		println("> (visual) create dust")
diff --git a/isotest/bits/main.v b/isotest/bits/main.v
index eb4f114..82c93b6 100644
--- a/isotest/bits/main.v
+++ b/isotest/bits/main.v
@@ -70,7 +70,7 @@ pub fn bits_main() {
 	//ob.dim_x = 2
 	//ob.dim_y = 2
 	//ob.dim_z = 2
-	ob.set_size(2, 2, 2)
+	//ob.set_size(2, 2, 2)
 	//ob.set_size(1, 1, 1)
 	println("size: ${ob.size()}")
 	println("volume: ${ob.volume()}")
diff --git a/isotest/bits/object.v b/isotest/bits/object.v
index 00c5ae9..1eaa06c 100644
--- a/isotest/bits/object.v
+++ b/isotest/bits/object.v
@@ -50,13 +50,20 @@ fn new_object() &Object {
 	return o
 }
 
-// Calc volume in bits
+// Calc total volume in bits
 fn (o &Object) bits_volume() int {
 	//return o.dim_x * o.dim_y * o.dim_z
-	return o.bits_size
+	//return o.bits_size
+
+	mut ret := 0
+	for me in o.mat_info.elems_list() {
+		ret += me.bits_size
+	}
+	
+	return ret
 }
 
-// Calc volume in m3
+// Calc total volume in m3
 fn (o &Object) volume() f32 {
 	return bits_to_m3(o.bits_volume())
 }
@@ -79,6 +86,7 @@ fn (o &Object) mass() f32 {
 	return total_mass
 }
 
+/*
 // Set size in meters
 fn (mut o Object) set_size(mx, my, mz f32) {
 	println("object set_size: mx: $mx, my: $my, mz: $mz")
@@ -105,6 +113,7 @@ fn (mut o Object) set_size(mx, my, mz f32) {
 
 	o.bits_size = vol_bits
 }
+*/
 
 // Get size in m3
 fn (o &Object) size() f32 {