   D3DBLENDOP Modulate?
  Hello,why isnt there a D3DBLENDOP_MODUALTE?I would like to modulate while blending, how do i achieve that?will i have to use some 'dummy texture' and use D3DTOP_MODULATE?or is there a better way?thx alot!   
  I don't think I follow... there is a D3DTOP_MODULATE (and 2x/4x versions)??Structuring complex blending effects with the old style FF pipeline can be non-trivial. Drawing it out on paper always helped me...Depending on what you're trying to do you might have to insert/add an additional texture stage that modulates and feeds the result down.Some more details on what you're trying to do might be useful.Alternatively, just make things simpler and use shaders [grin]hthJack   ;  If you mean for frame buffer blending using D3DRS_SRCBLEND/D3DRS_DESTBLEND, then take a closer look at the available frame buffer blending equation:RESULTrgb = (SOURCErgb * SOURCEfactor) + (DESTrgb * DESTfactor)where SOURCEfactor is controlled by D3DRS_SRCBLEND and DESTfactor by D3DRS_DESTBLENDThen take a look at the things you can specify for SOURCEfactor and DESTfactor, of interest for a straight modulate are:D3DBLEND_ZEROD3DBLEND_SRCCOLORD3DBLEND_DESTCOLORConsider for example:RESULTrgb = (SOURCErgb * D3DBLEND_DESTCOLOR) + (DESTrgb * D3DBLEND_ZERO)orRESULTrgb = (SOURCErgb * D3DBLEND_ZERO) + (DESTrgb * D3DBLEND_SRCCOLOR)   ;  thx jack, what i am doing now is alpha blending wihout any textures just by using a D3DMATERIAL (i just need to blend a fixed color) , i was using the material alpha to do the blending, but now i need to make modulative blending and not additive one, so i looked at the options i have in D3DBLENDOP there is additive substractive, and some other options but no D3DBLENDOP_MODULATE.so i guess to make modulative blending i ll either have to use a texture and use texture blending op's or a shader ?   ;  ok S1CA thank you i will.   ;  To do a modulate blend mode you need to set your blendop to D3DBLENDOP_ADD, your SrcBlend to D3DBLEND_INVSRCALPHA and your DestBlend D3DBLEND_INVSRCALPHA.  This will modulate between src and dest color based on src alpba (so result==srcColor if srcAlpha=1.0 and result==destColor if srcAlpha==0.0)   ;Quote:Original post by griffin2000To do a modulate blend mode you need to set your blendop to D3DBLENDOP_ADD, your SrcBlend to D3DBLEND_INVSRCALPHA and your DestBlend D3DBLEND_INVSRCALPHA.  This will modulate between src and dest color based on src alpba (so result==srcColor if srcAlpha=1.0 and result==destColor if srcAlpha==0.0)this is what i was using before, i would call this additive blending no?what S1CA suggested:RESULTrgb = (SOURCErgb * D3DBLEND_ZERO) + (DESTrgb * D3DBLEND_SRCCOLOR)seems to be what i need.;  Its what I'd call a modulate (I'd say Additive was a having DestBlend of ONE).  But your right, what S1CA describes is the equivalent of D3DTOP_MODULATE (what I desribe is the equivalent of  D3DTOP_BLEND...).   