new 'dw_volume_integrate_variable' - volume integration with a variable
new 'dw_volume_integrate_variable' - volume integration with a variable

RexFuzzle/sfepy,vlukes/sfepy,rc/sfepy,RexFuzzle/sfepy,vlukes/sfepy,BubuLK/sfepy,RexFuzzle/sfepy,vlukes/sfepy,lokik/sfepy,lokik/sfepy,lokik/sfepy,sfepy/sfepy,lokik/sfepy,olivierverdier/sfepy,sfepy/sfepy,RexFuzzle/sfepy,BubuLK/sfepy,olivierverdier/sfepy,BubuLK/sfepy,rc/sfepy,olivierverdier/sfepy,sfepy/sfepy,rc/sfepy