Shadow

继承Ogl的Shadow。

Methods

add(node, opts = {})

将元素添加到阴影层用于显示阴影

opts参数如下：

• receive = true,
• cast = true,
• vertex = defaultVertex,
• fragment = defaultFragment,
• uniformProjection = ‘shadowProjectionMatrix’,
• uniformView = ‘shadowViewMatrix’,
• uniformTexture = ‘tShadow’,