Draw 3D with Python more in front I have an addon with that I draw in 3d space (lines). The vertices are where I click with the mouse cursor.



I use the region_2d_to_location to get a point from the mouse coordinates in 3d space. But I want to draw a bit more "in front" like 2 or 3 units in direction of the view camera (hope this is understandable:-))

I guess I have to manipulate the last parameter of the region_2d_to_location function, but how to calculate this location dependant on the current view?

I guess I can use the 

bpy.context.space_data.region_3d.view_rotation


and then kind of multiply a vector like (2,2,2) with it to draw in a distance to the origin. Any ideas on how to do this with this Quaterion?
Thx to @batFINGER, here is the code that works (@ is important for multiplying Quaternion and Vector in Blender 2.8):

rot = bpy.context.space_data.region_3d.view_rotation

# Instead of adding it to the vector that is returned by region_2d_to_location_3d
# I pass it to the method as last argument
dir = rot @ mathutils.Vector((0,0,-1))
dir = dir.normalized() * -2.0

vec = region_2d_to_location_3d(region, rv3d, (x, y), dir)