How can i add this effect of light?

Hey BA forum, i was looking to see if i could add volumetric light into my game, here is the effect i desire http://www.google.com.au/imgres?imgurl=http://vrayc4d.com/manuals/sites/default/files/file/scenes/test-scenes/volumetric-light-414.jpg&imgrefurl=http://vrayc4d.com/manuals/files/scenes/test-scenes/volumetric-light-414&h=600&w=800&sz=18&tbnid=Ri_SHcnvMitu9M:&tbnh=99&tbnw=132&zoom=1&usg=__wNsi_lL1clOFBt4Y3yuwMIfTvHI=&docid=HxTvDZPTI7BBeM&sa=X&ei=Ck1AUsP9JMayiAex3oHQBw&ved=0CD4Q9QEwBA

I have already tried it using an alpha-gold gradient in GIMP but with no luck, please leave a guide or short tutorial below, thanks a ton!

Use a alpha texture :smiley: or a shader.

God rays?

BluePrint the God rays and the volumetric light are 2 things.

I really want to do this myself, alpha on planes really hits performance and looks a tad crappy.

Don’t do alpha, do add. Add is meant for fake light