Add alpha ctor kwarg for renderers

Author: vidartf

js/src/_base/Renderable.js

@@ -296,6 +296,7 @@ var RenderableView = widgets.DOMWidgetView.extend({
 
         var config = {
             antialias: this.model.get('_antialias'),
+            alpha: this.model.get('_alpha'),
         };
         this.renderer = RendererPool.acquire(
             config,

js/src/core/Renderer.js

@@ -17,6 +17,8 @@ var RendererModel = RenderableModel.extend({
 
             _view_name: 'RendererView',
             _model_name: 'RendererModel',
+            _antialias: false,
+            _alpha: false,
 
             scene: null,
             camera: null,

pythreejs/_base/renderable.py

@@ -20,6 +20,7 @@ class RenderableWidget(DOMWidget):
     _width = CInt(200).tag(sync=True)
     _height = CInt(200).tag(sync=True)
     _antialias = Bool(False).tag(sync=True)
+    _alpha = Bool(False).tag(sync=True)
 
     autoClear = Bool(True).tag(sync=True)
     autoClearColor = Bool(True).tag(sync=True)

pythreejs/core/Renderer.py

@@ -32,12 +32,13 @@ class Renderer(RenderableWidget):
     background = Color('black', allow_none=True).tag(sync=True)
     background_opacity = Float(1.0, min=0.0, max=1.0).tag(sync=True)
 
-    def __init__(self, scene, camera, controls=None, antialias=False, **kwargs):
+    def __init__(self, scene, camera, controls=None, antialias=False, alpha=False, **kwargs):
         super(Renderer, self).__init__(
             scene=scene,
             camera=camera,
             controls=controls or [],
             _antialias=antialias,
+            _alpha=alpha,
             **kwargs)
         link((self, 'width'), (self, '_width'))
         link((self, 'height'), (self, '_height'))

pythreejs/renderers/WebGLRenderer.py

@@ -19,8 +19,8 @@ class WebGLRenderer(RenderableWidget):
     width = CInt(200)
     height = CInt(200)
 
-    def __init__(self, antialias=False, **kwargs):
-        super(WebGLRenderer, self).__init__(_antialias=antialias, **kwargs)
+    def __init__(self, antialias=False, alpha=False, **kwargs):
+        super(WebGLRenderer, self).__init__(_antialias=antialias, _alpha=alpha, **kwargs)
         link((self, 'width'), (self, '_width'))
         link((self, 'height'), (self, '_height'))