Simplify reflection enabled condition and handle null render target

src/runtime-three/runtime-host.ts

@@ -657,7 +657,7 @@ export class RuntimeHost {
         contactPatches,
         reflection: {
           texture: null,
-          enabled: faceId === "posY" && this.getWaterReflectionMode() !== "none"
+          enabled: faceId === "posY"
         }
       });
 
@@ -833,7 +833,6 @@ export class RuntimeHost {
     for (const binding of this.runtimeWaterContactUniforms) {
       if (
         reflectionMode === "none" ||
-        binding.reflectionRenderTarget === null ||
         binding.reflectionTextureUniform === null ||
         binding.reflectionMatrixUniform === null ||
         binding.reflectionEnabledUniform === null
@@ -844,6 +843,10 @@ export class RuntimeHost {
         continue;
       }
 
+      if (binding.reflectionRenderTarget === null) {
+        binding.reflectionRenderTarget = this.createWaterReflectionRenderTarget();
+      }
+
       const canRenderReflection = updatePlanarReflectionCamera(
         binding.brush,
         this.camera,
@@ -851,7 +854,7 @@ export class RuntimeHost {
         binding.reflectionMatrixUniform.value
       );
 
-      if (!canRenderReflection) {
+      if (!canRenderReflection || binding.reflectionRenderTarget === null) {
         binding.reflectionEnabledUniform.value = 0;
         continue;
       }