Allow to update the vertex/fragment code

src/PostProcesses/postProcess.ts

@@ -402,10 +402,12 @@ export class PostProcess {
      * @param indexParameters The index parameters to be used for babylons include syntax "#include<kernelBlurVaryingDeclaration>[0..varyingCount]". (default: undefined) See usage in babylon.blurPostProcess.ts and kernelBlur.vertex.fx
      * @param onCompiled Called when the shader has been compiled.
      * @param onError Called if there is an error when compiling a shader.
+     * @param vertexUrl The url of the vertex shader to be used (default: the one given at construction time)
+     * @param fragmentUrl The url of the fragment shader to be used (default: the one given at construction time)
      */
     public updateEffect(defines: Nullable<string> = null, uniforms: Nullable<string[]> = null, samplers: Nullable<string[]> = null, indexParameters?: any,
-        onCompiled?: (effect: Effect) => void, onError?: (effect: Effect, errors: string) => void) {
-        this._effect = this._engine.createEffect({ vertex: this._vertexUrl, fragment: this._fragmentUrl },
+        onCompiled?: (effect: Effect) => void, onError?: (effect: Effect, errors: string) => void, vertexUrl?: string, fragmentUrl?: string) {
+        this._effect = this._engine.createEffect({ vertex: vertexUrl ?? this._vertexUrl, fragment: fragmentUrl ?? this._fragmentUrl },
             ["position"],
             uniforms || this._parameters,
             samplers || this._samplers,