feat(文件拆分): 拆分几何三维基础能力

internal/base/threed/u3d_finite.go

@@ -0,0 +1,26 @@
+// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package threed
+
+import (
+	"math"
+)
+
+// finite 判断数值是否有限
+// 入参: value 数值
+// 返回: bool 是否有限
+func finite(value float64) bool {
+	return !math.IsNaN(value) && !math.IsInf(value, 0)
+}