fixing default draw buffer

src/Materials/Textures/multiRenderTarget.ts

@@ -213,12 +213,12 @@ export class MultiRenderTarget extends RenderTargetTexture {
         }
 
         if (this.samples !== 1) {
-            this._getEngine()!.updateMultipleRenderTargetTextureSampleCount(this._internalTextures, this.samples, this._drawOnlyOnFirstAttachmentByDefault);
+            this._getEngine()!.updateMultipleRenderTargetTextureSampleCount(this._internalTextures, this.samples, !this._drawOnlyOnFirstAttachmentByDefault);
         }
     }
 
     private _createInternalTextures(): void {
-        this._internalTextures = this._getEngine()!.createMultipleRenderTarget(this._size, this._multiRenderTargetOptions, this._drawOnlyOnFirstAttachmentByDefault);
+        this._internalTextures = this._getEngine()!.createMultipleRenderTarget(this._size, this._multiRenderTargetOptions, !this._drawOnlyOnFirstAttachmentByDefault);
 
         // Keeps references to frame buffer and stencil/depth buffer
         this._texture = this._internalTextures[0];