Merge pull request #5120 from sebavan/FixPreWarm

Address none ready mesh worl matrix computation

src/Particles/babylon.particleSystem.ts

@@ -1009,6 +1009,10 @@
             }
 
             if (this.preWarmCycles) {
+                if (this.emitter instanceof AbstractMesh) {
+                    this.emitter.computeWorldMatrix(true);
+                }
+
                 let noiseTextureAsProcedural = this.noiseTexture as ProceduralTexture;
 
                 if (noiseTextureAsProcedural && noiseTextureAsProcedural.onGeneratedObservable) {