create simplest scene-based 3D point cloud example. Closes #1028
create simplest scene-based 3D point cloud example. Closes #1028

jdreaver/vispy,srinathv/vispy,julienr/vispy,RebeccaWPerry/vispy,jdreaver/vispy,sbtlaarzc/vispy,RebeccaWPerry/vispy,RebeccaWPerry/vispy,kkuunnddaannkk/vispy,QuLogic/vispy,michaelaye/vispy,dchilds7/Deysha-Star-Formation,inclement/vispy,jay3sh/vispy,dchilds7/Deysha-Star-Formation,sbtlaarzc/vispy,sh4wn/vispy,inclement/vispy,Eric89GXL/vispy,Eric89GXL/vispy,kkuunnddaannkk/vispy,bollu/vispy,ghisvail/vispy,jay3sh/vispy,sh4wn/vispy,jdreaver/vispy,QuLogic/vispy,srinathv/vispy,julienr/vispy,jay3sh/vispy,bollu/vispy,michaelaye/vispy,inclement/vispy,Eric89GXL/vispy,kkuunnddaannkk/vispy,ghisvail/vispy,ghisvail/vispy,julienr/vispy,drufat/vispy,drufat/vispy,QuLogic/vispy,sbtlaarzc/vispy,drufat/vispy,srinathv/vispy,dchilds7/Deysha-Star-Formation,bollu/vispy,michaelaye/vispy,sh4wn/vispy