diff --git a/packages/cultmath/shaders/CultMath.Cycles.glsl b/packages/cultmath/shaders/CultMath.Cycles.glsl
index d640762f..67639b07 100644
--- a/packages/cultmath/shaders/CultMath.Cycles.glsl
+++ b/packages/cultmath/shaders/CultMath.Cycles.glsl
@@ -42,7 +42,8 @@ float cultmath_cycles_power(float a, float b)
     if (a < 0.0)
     {
         float magnitude = pow(-a, b);
-        return b - 2.0 * floor(0.5 * b) != 0.0 ? -magnitude : magnitude;
+        // Odd exactly when the remainder is 1: an infinite exponent leaves NaN here and is even, as powf(a, +-inf) is never negative.
+        return b - 2.0 * floor(0.5 * b) == 1.0 ? -magnitude : magnitude;
     }
     return pow(a, b);
 }
diff --git a/packages/cultmath/tests/CultMath.Tests/fixtures/cycles-oracle/infinite.json b/packages/cultmath/tests/CultMath.Tests/fixtures/cycles-oracle/infinite.json
new file mode 100644
index 00000000..fef190a9
--- /dev/null
+++ b/packages/cultmath/tests/CultMath.Tests/fixtures/cycles-oracle/infinite.json
@@ -0,0 +1,75 @@
+{
+ "oracle": "tools/cycles-oracle/oracle.py (Blender 5.2.2 LTS, build d13f752e3b9c, Cycles CPU, 1 sample, Emit bake, float Non-Color images)",
+ "blender": "5.2.2 LTS",
+ "build_hash": "d13f752e3b9c",
+ "platform": "Linux",
+ "encoding": "each case is 'operands -> results', every scalar a float32 bit pattern in hex, colours flattened as r g b",
+ "family": "infinite",
+ "functions": [
+  {
+   "function": "cycles_power",
+   "node": "ShaderNodeMath POWER",
+   "cases": [
+    "bf800000 inf -> 3f800000",
+    "bf800000 -inf -> 3f800000",
+    "c0000000 inf -> inf",
+    "c0000000 -inf -> 00000000",
+    "bf000000 inf -> 00000000",
+    "bf000000 -inf -> inf",
+    "80000000 inf -> 00000000",
+    "80000000 -inf -> 00000000",
+    "3f000000 inf -> 00000000",
+    "3f000000 -inf -> inf",
+    "40000000 inf -> inf",
+    "40000000 -inf -> 00000000",
+    "3f800000 inf -> 3f800000",
+    "00000000 inf -> 00000000",
+    "00000000 -inf -> 00000000",
+    "inf 40400000 -> inf",
+    "-inf 40400000 -> -inf",
+    "-inf 40000000 -> inf",
+    "inf bf800000 -> 00000000",
+    "-inf bf800000 -> 00000000",
+    "-inf inf -> inf",
+    "inf inf -> inf"
+   ]
+  },
+  {
+   "function": "cycles_modulo",
+   "node": "ShaderNodeMath MODULO",
+   "cases": [
+    "inf 3f800000 -> nan",
+    "-inf 3f800000 -> nan",
+    "inf 40400000 -> nan",
+    "-inf 40400000 -> nan",
+    "inf 3dcccccd -> nan",
+    "-inf 3dcccccd -> nan",
+    "inf c0000000 -> nan",
+    "40a00000 inf -> 40a00000",
+    "c0a00000 inf -> c0a00000",
+    "40a00000 -inf -> 40a00000",
+    "inf inf -> nan",
+    "-inf inf -> nan",
+    "00000000 inf -> 00000000",
+    "inf 00000000 -> 00000000"
+   ]
+  },
+  {
+   "function": "cycles_map_range_smoothstep",
+   "node": "ShaderNodeMapRange SMOOTHSTEP",
+   "cases": [
+    "-inf -inf 3f800000 40000000 40400000 -> nan",
+    "-inf 3f800000 -inf 40000000 40400000 -> nan",
+    "-inf 3f800000 40a00000 40000000 40400000 -> 40000000",
+    "-inf c0a00000 3f800000 40000000 40400000 -> 40000000",
+    "inf c0a00000 3f800000 40000000 40400000 -> 40400000",
+    "inf 3f800000 c0a00000 40000000 40400000 -> 40000000",
+    "inf inf 3f800000 40000000 40400000 -> 40000000",
+    "inf 3f800000 inf 40000000 40400000 -> 40400000",
+    "-inf inf 3f800000 40000000 40400000 -> 40400000",
+    "-inf 3f800000 inf 40000000 40400000 -> 40000000",
+    "3f800000 -inf inf 40000000 40400000 -> nan"
+   ]
+  }
+ ]
+}