how do I draw triangles with ISmartBlockModel? or is there an alternative?

I know but,

1) wouldn't that be a waste if gpu power? (not that I think my gpu can't handle it but.)

2) how? if we use

list.add(faceBakery.makeBakedQuad(new Vector3f(6.0F, 10.0F, 10.0F), new Vector3f(10.0F, 10.0F, 16.0F), face, redstoneTexture, EnumFacing.UP, modelRot, null, true, true));

we specify 2 points not 4. or can we create our own BakedQuad? and if so how?

Opposite corners are enough to define a quad which is axis-aligned.

 

BakedQuad's constructor is public. An example of constructing BakedQuads is here:

 

https://github.com/TheGreyGhost/MinecraftByExample/blob/master/src/main/java/minecraftbyexample/mbe15_item_smartitemmodel/ChessboardSmartItemModel.java

 

Not sure why TGG doesn't use FaceBakery. Maybe because #makeBakedQuad wants a BlockPartRotation and BlockPartFace, which in turn wants a BlockFaceUV ...