I'm only using blend mode "add" which I presume should be quite quick.
Problem is that black objects with a spherical, added environment map locks great if multitexturing is enabled where as the blocks nearly become invisible if multitexturing is switched off =) Which is not very good.
Problem is that black objects with a spherical, added environment map locks great if multitexturing is enabled where as the blocks nearly become invisible if multitexturing is switched off =) Which is not very good.