增加LightPosition3D.vert计算顶点方向光，配合SceneTree范例

shader/OnlyPosition3D.vert

@@ -11,6 +11,7 @@ layout(binding=0) uniform WorldMatrix     // hgl/math/Math.h
 
     mat4 modelview;
     mat4 inverse_modelview;
+    mat3 normal;
 
     mat4 mvp;
     mat4 inverse_mvp;
@@ -18,11 +19,11 @@ layout(binding=0) uniform WorldMatrix     // hgl/math/Math.h
     vec4 view_pos;
     vec2 canvas_resolution;
     vec2 viewport_resolution;
-} world;
+}world;
 
 layout(push_constant) uniform Consts {
     mat4 local_to_world;
-} pc;
+}pc;
 
 void main()
 {