添加关照、全局等高线、修改图层问题

static/sdk/three/jsm/renderers/webgl/utils/WebGLCapabilities.js

@@ -0,0 +1,36 @@
+class WebGLCapabilities {
+
+	constructor( backend ) {
+
+		this.backend = backend;
+
+		this.maxAnisotropy = null;
+
+	}
+
+	getMaxAnisotropy() {
+
+		if ( this.maxAnisotropy !== null ) return this.maxAnisotropy;
+
+		const gl = this.backend.gl;
+		const extensions = this.backend.extensions;
+
+		if ( extensions.has( 'EXT_texture_filter_anisotropic' ) === true ) {
+
+			const extension = extensions.get( 'EXT_texture_filter_anisotropic' );
+
+			this.maxAnisotropy = gl.getParameter( extension.MAX_TEXTURE_MAX_ANISOTROPY_EXT );
+
+		} else {
+
+			this.maxAnisotropy = 0;
+
+		}
+
+		return this.maxAnisotropy;
+
+	}
+
+}
+
+export default WebGLCapabilities;