fixed gfx examples

examples/gfx/ambient_occlusion1.py

-s=io.LoadSurface("../surf/sdh","msms")
+s=io.LoadSurface("../demos/data/sh2","msms")
 scene.Add(gfx.Surface("s",s))
 
 # alternative shading mode
@@ -17,8 +17,3 @@ scene.SetAmbientOcclusionWeight(1.0)
 # AO algorithms 0-3, default is 1
 scene.SetAmbientOcclusionMode(1)
 
-# orientation
-scene.SetRTC(geom.Mat4(0.827929,-0.460893,-0.319547,29.688,
-                       0.174973,0.753608,-0.633609,19.9405,
-                       0.532839,0.468671,0.704578,73.0075,
-                       -5.4704,1.54823,-116,1))

examples/gfx/ambient_occlusion2.py

-e=io.LoadPDB("../entity/sdh.pdb")
+
+e=io.LoadPDB("../demos/data/sdh.pdb")
 scene.Add(gfx.Entity("x",gfx.CPK,e.Select("chain=A")))
 
 # fast spheres with 3D sprites, default

examples/gfx/hsc_hemilight.py

-e=io.LoadPDB("../entity/sdh.pdb")
+e=io.LoadPDB("../demos/data/sdh.pdb")
 scene.Add(gfx.Entity("x",gfx.HSC,e.Select("chain=A")))
 scene["x"].GetOptions(gfx.HSC).SetTubeRadius(0.6)
 # spiral helices (default)

examples/gfx/shadow_mapping.py

-s=io.LoadSurface("../surf/sdh","msms")
+s=io.LoadSurface("../demos/data/sh2","msms")
 scene.Add(gfx.Surface("s",s))
 
 # alternative shading mode
@@ -11,12 +11,5 @@ scene["s"].SetOutlineMode(3)
 # turn on realtime shadow mapping
 scene.SetShadow(True)
 
-# this influences the size of the shadow map
-# size = (quality+1)*256, up to quality=8
-scene.SetShadowQuality(1) # default
+scene.SetShadowQuality(3) # default
 
-# orientation
-scene.SetRTC(geom.Mat4(0.827929,-0.460893,-0.319547,29.688,
-                       0.174973,0.753608,-0.633609,19.9405,
-                       0.532839,0.468671,0.704578,73.0075,
-                       -5.4704,1.54823,-116,1))

examples/gfx/transp.py

-e=io.LoadPDB("../entity/sdh.pdb")
-s=io.LoadSurface("../surf/sdh","msms")
+e=io.LoadPDB("../demos/data/sh2.pdb")
+s=io.LoadSurface("../demos/data/sh2","msms")
 
 scene.Add(gfx.Entity("x",gfx.HSC,e.Select("chain=A")))
 scene["x"].SetColor(gfx.Color(0.9,0.95,1.0))
@@ -11,10 +11,3 @@ scene["s"].SetOpacity(0.4)
 scene["s"].SetMat(0,1,0,0)
 
 scene.bg=gfx.WHITE
-
-scene.SetRTC(geom.Mat4(-0.589889,-0.594876,0.546034,28.2245,
-                        0.806165,-0.472502,0.356147,20.1685,
-                        0.0461388,0.65028,0.758291,73.5665,
-                        -3.52709,1.72253,-120,1))
-
-