Fixed Splats in Scene Flickering When Adding or Removing (#87)

* Fixed Splats in Scene Flickering When Adding or Removing
* Fixed splats flashing
* Made it so that the entire render program doesnt need to rebuild on add or remove splat
* Fixed Webgl Warning about drawArraysInstance fetch requires...

* fixed Scene import

src/renderers/webgl/programs/RenderProgram.ts

@@ -7,6 +7,7 @@ import { Color32 } from "../../../math/Color32";
 import { ObjectAddedEvent, ObjectChangedEvent, ObjectRemovedEvent } from "../../../events/Events";
 import { Splat } from "../../../splats/Splat";
 import { WebGLRenderer } from "../../WebGLRenderer";
+import { Scene } from "../../../core/Scene"
 
 const vertexShaderSource = /* glsl */ `#version 300 es
 precision highp float;
@@ -303,7 +304,7 @@ class RenderProgram extends ShaderProgram {
                 e.object.addEventListener("objectChanged", handleObjectChanged);
             }
 
-            this.dispose();
+            resetSplatData();
         };
 
         const handleObjectRemoved = (event: Event) => {
@@ -313,7 +314,7 @@ class RenderProgram extends ShaderProgram {
                 e.object.removeEventListener("objectChanged", handleObjectChanged);
             }
 
-            this.dispose();
+            resetSplatData();
         };
 
         const handleObjectChanged = (event: Event) => {
@@ -324,6 +325,14 @@ class RenderProgram extends ShaderProgram {
             }
         };
 
+        const resetSplatData = () => {
+            this._renderData?.dispose();
+            this._renderData = new RenderData(this._scene as Scene);
+
+            this._worker?.terminate();
+            createWorker();
+        };
+
         this._render = () => {
             if (!this._scene || !this._camera || !this.renderData) {
                 console.error("Cannot render without scene and camera");
@@ -478,7 +487,7 @@ class RenderProgram extends ShaderProgram {
             gl.vertexAttribIPointer(indexAttribute, 1, gl.INT, 0, 0);
             gl.vertexAttribDivisor(indexAttribute, 1);
 
-            gl.drawArraysInstanced(gl.TRIANGLE_FAN, 0, 4, this.renderData.vertexCount);
+            gl.drawArraysInstanced(gl.TRIANGLE_FAN, 0, 4, this.depthIndex.length);
         };
 
         this._dispose = () => {