3D / voxel unit tests
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tests/unit/voxel_bulk_ops_test.py
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335
tests/unit/voxel_bulk_ops_test.py
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#!/usr/bin/env python3
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"""Unit tests for VoxelGrid bulk operations (Milestone 11)
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Tests:
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- fill_box_hollow: Verify shell only, interior empty
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- fill_sphere: Volume roughly matches (4/3)πr³
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- fill_cylinder: Volume roughly matches πr²h
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- fill_noise: Higher threshold = fewer voxels
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- copy_region/paste_region: Round-trip verification
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- skip_air option for paste
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"""
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import sys
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import math
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# Track test results
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passed = 0
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failed = 0
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def test(name, condition, detail=""):
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"""Record test result"""
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global passed, failed
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if condition:
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print(f"[PASS] {name}")
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passed += 1
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else:
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print(f"[FAIL] {name}" + (f" - {detail}" if detail else ""))
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failed += 1
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def test_fill_box_hollow_basic():
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"""fill_box_hollow creates correct shell"""
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import mcrfpy
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vg = mcrfpy.VoxelGrid(size=(10, 10, 10))
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stone = vg.add_material("stone", color=mcrfpy.Color(128, 128, 128))
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# Create hollow 6x6x6 box with thickness 1
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vg.fill_box_hollow((2, 2, 2), (7, 7, 7), stone, thickness=1)
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# Total box = 6x6x6 = 216
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# Interior = 4x4x4 = 64
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# Shell = 216 - 64 = 152
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expected = 152
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actual = vg.count_non_air()
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test("Hollow box: shell has correct voxel count", actual == expected,
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f"got {actual}, expected {expected}")
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# Verify interior is empty (center should be air)
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test("Hollow box: interior is air", vg.get(4, 4, 4) == 0)
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test("Hollow box: interior is air (another point)", vg.get(5, 5, 5) == 0)
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# Verify shell exists
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test("Hollow box: corner is filled", vg.get(2, 2, 2) == stone)
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test("Hollow box: edge is filled", vg.get(4, 2, 2) == stone)
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def test_fill_box_hollow_thick():
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"""fill_box_hollow with thickness > 1"""
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import mcrfpy
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vg = mcrfpy.VoxelGrid(size=(12, 12, 12))
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stone = vg.add_material("stone", color=mcrfpy.Color(128, 128, 128))
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# Create hollow 10x10x10 box with thickness 2
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vg.fill_box_hollow((1, 1, 1), (10, 10, 10), stone, thickness=2)
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# Total box = 10x10x10 = 1000
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# Interior = 6x6x6 = 216
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# Shell = 1000 - 216 = 784
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expected = 784
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actual = vg.count_non_air()
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test("Thick hollow box: correct voxel count", actual == expected,
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f"got {actual}, expected {expected}")
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# Verify interior is empty
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test("Thick hollow box: center is air", vg.get(5, 5, 5) == 0)
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def test_fill_sphere_volume():
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"""fill_sphere produces roughly spherical shape"""
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import mcrfpy
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vg = mcrfpy.VoxelGrid(size=(30, 30, 30))
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stone = vg.add_material("stone", color=mcrfpy.Color(128, 128, 128))
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# Fill sphere with radius 8
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radius = 8
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vg.fill_sphere((15, 15, 15), radius, stone)
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# Expected volume ≈ (4/3)πr³
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expected_vol = (4.0 / 3.0) * math.pi * (radius ** 3)
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actual = vg.count_non_air()
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# Voxel sphere should be within 20% of theoretical volume
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ratio = actual / expected_vol
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test("Sphere volume: within 20% of (4/3)πr³",
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0.8 <= ratio <= 1.2,
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f"got {actual}, expected ~{int(expected_vol)}, ratio={ratio:.2f}")
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def test_fill_sphere_carve():
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"""fill_sphere with material 0 carves out voxels"""
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import mcrfpy
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vg = mcrfpy.VoxelGrid(size=(20, 20, 20))
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stone = vg.add_material("stone", color=mcrfpy.Color(128, 128, 128))
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# Fill entire grid with stone
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vg.fill(stone)
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initial = vg.count_non_air()
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test("Sphere carve: initial fill", initial == 8000) # 20x20x20
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# Carve out a sphere (material 0)
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vg.fill_sphere((10, 10, 10), 5, 0) # Air
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final = vg.count_non_air()
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test("Sphere carve: voxels removed", final < initial)
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def test_fill_cylinder_volume():
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"""fill_cylinder produces roughly cylindrical shape"""
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import mcrfpy
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vg = mcrfpy.VoxelGrid(size=(30, 30, 30))
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stone = vg.add_material("stone", color=mcrfpy.Color(128, 128, 128))
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# Fill cylinder with radius 5, height 10
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radius = 5
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height = 10
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vg.fill_cylinder((15, 5, 15), radius, height, stone)
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# Expected volume ≈ πr²h
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expected_vol = math.pi * (radius ** 2) * height
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actual = vg.count_non_air()
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# Voxel cylinder should be within 20% of theoretical volume
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ratio = actual / expected_vol
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test("Cylinder volume: within 20% of πr²h",
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0.8 <= ratio <= 1.2,
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f"got {actual}, expected ~{int(expected_vol)}, ratio={ratio:.2f}")
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def test_fill_cylinder_bounds():
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"""fill_cylinder respects grid bounds"""
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import mcrfpy
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vg = mcrfpy.VoxelGrid(size=(10, 10, 10))
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stone = vg.add_material("stone", color=mcrfpy.Color(128, 128, 128))
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# Cylinder partially outside grid
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vg.fill_cylinder((2, 0, 2), 3, 15, stone) # height extends beyond grid
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# Should not crash, and have some voxels
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count = vg.count_non_air()
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test("Cylinder bounds: handles out-of-bounds gracefully", count > 0)
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test("Cylinder bounds: limited by grid height", count < 3.14 * 9 * 15)
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def test_fill_noise_threshold():
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"""fill_noise: higher threshold = fewer voxels"""
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import mcrfpy
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vg1 = mcrfpy.VoxelGrid(size=(16, 16, 16))
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vg2 = mcrfpy.VoxelGrid(size=(16, 16, 16))
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stone = vg1.add_material("stone", color=mcrfpy.Color(128, 128, 128))
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vg2.add_material("stone", color=mcrfpy.Color(128, 128, 128))
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# Same seed, different thresholds
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vg1.fill_noise((0, 0, 0), (15, 15, 15), stone, threshold=0.3, scale=0.15, seed=12345)
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vg2.fill_noise((0, 0, 0), (15, 15, 15), stone, threshold=0.7, scale=0.15, seed=12345)
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count1 = vg1.count_non_air()
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count2 = vg2.count_non_air()
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# Higher threshold should produce fewer voxels
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test("Noise threshold: high threshold produces fewer voxels",
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count2 < count1,
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f"threshold=0.3 gave {count1}, threshold=0.7 gave {count2}")
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def test_fill_noise_seed():
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"""fill_noise: same seed produces same result"""
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import mcrfpy
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vg1 = mcrfpy.VoxelGrid(size=(16, 16, 16))
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vg2 = mcrfpy.VoxelGrid(size=(16, 16, 16))
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stone = vg1.add_material("stone", color=mcrfpy.Color(128, 128, 128))
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vg2.add_material("stone", color=mcrfpy.Color(128, 128, 128))
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# Same parameters
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vg1.fill_noise((0, 0, 0), (15, 15, 15), stone, threshold=0.5, scale=0.1, seed=42)
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vg2.fill_noise((0, 0, 0), (15, 15, 15), stone, threshold=0.5, scale=0.1, seed=42)
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# Should produce identical results
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count1 = vg1.count_non_air()
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count2 = vg2.count_non_air()
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test("Noise seed: same seed produces same count", count1 == count2,
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f"got {count1} vs {count2}")
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# Check a few sample points
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same_values = True
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for x, y, z in [(0, 0, 0), (8, 8, 8), (15, 15, 15), (3, 7, 11)]:
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if vg1.get(x, y, z) != vg2.get(x, y, z):
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same_values = False
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break
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test("Noise seed: same seed produces identical voxels", same_values)
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def test_copy_paste_basic():
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"""copy_region and paste_region round-trip"""
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import mcrfpy
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vg = mcrfpy.VoxelGrid(size=(20, 10, 20))
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stone = vg.add_material("stone", color=mcrfpy.Color(128, 128, 128))
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brick = vg.add_material("brick", color=mcrfpy.Color(165, 42, 42))
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# Create a small structure
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vg.fill_box((2, 0, 2), (5, 3, 5), stone)
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vg.set(3, 1, 3, brick) # Add a different material
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# Copy the region
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prefab = vg.copy_region((2, 0, 2), (5, 3, 5))
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# Verify VoxelRegion properties
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test("Copy region: correct width", prefab.width == 4)
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test("Copy region: correct height", prefab.height == 4)
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test("Copy region: correct depth", prefab.depth == 4)
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test("Copy region: size tuple", prefab.size == (4, 4, 4))
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# Paste elsewhere
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vg.paste_region(prefab, (10, 0, 10))
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# Verify paste
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test("Paste region: stone at corner", vg.get(10, 0, 10) == stone)
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test("Paste region: brick inside", vg.get(11, 1, 11) == brick)
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def test_copy_paste_skip_air():
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"""paste_region with skip_air=True doesn't overwrite"""
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import mcrfpy
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vg = mcrfpy.VoxelGrid(size=(20, 10, 20))
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stone = vg.add_material("stone", color=mcrfpy.Color(128, 128, 128))
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gold = vg.add_material("gold", color=mcrfpy.Color(255, 215, 0))
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# Create prefab with air gaps
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vg.fill_box((0, 0, 0), (3, 3, 3), stone)
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vg.set(1, 1, 1, 0) # Air hole
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vg.set(2, 2, 2, 0) # Another air hole
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# Copy it
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prefab = vg.copy_region((0, 0, 0), (3, 3, 3))
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# Place gold in destination
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vg.set(11, 1, 11, gold) # Where air hole will paste
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vg.set(12, 2, 12, gold) # Where another air hole will paste
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# Paste with skip_air=True (default)
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vg.paste_region(prefab, (10, 0, 10), skip_air=True)
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# Gold should still be there (air didn't overwrite)
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test("Skip air: preserves existing material", vg.get(11, 1, 11) == gold)
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test("Skip air: preserves at other location", vg.get(12, 2, 12) == gold)
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def test_copy_paste_overwrite():
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"""paste_region with skip_air=False overwrites"""
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import mcrfpy
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vg = mcrfpy.VoxelGrid(size=(20, 10, 20))
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stone = vg.add_material("stone", color=mcrfpy.Color(128, 128, 128))
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gold = vg.add_material("gold", color=mcrfpy.Color(255, 215, 0))
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# Create prefab with air gap
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vg.fill_box((0, 0, 0), (3, 3, 3), stone)
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vg.set(1, 1, 1, 0) # Air hole
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# Copy it
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prefab = vg.copy_region((0, 0, 0), (3, 3, 3))
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# Clear and place gold in destination
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vg.clear()
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vg.set(11, 1, 11, gold)
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# Paste with skip_air=False
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vg.paste_region(prefab, (10, 0, 10), skip_air=False)
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# Gold should be overwritten with air
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test("Overwrite air: replaces existing material", vg.get(11, 1, 11) == 0)
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def test_voxel_region_repr():
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"""VoxelRegion has proper repr"""
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import mcrfpy
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vg = mcrfpy.VoxelGrid(size=(10, 10, 10))
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stone = vg.add_material("stone", color=mcrfpy.Color(128, 128, 128))
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vg.fill_box((0, 0, 0), (4, 4, 4), stone)
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prefab = vg.copy_region((0, 0, 0), (4, 4, 4))
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rep = repr(prefab)
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test("VoxelRegion repr: contains dimensions", "5x5x5" in rep)
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test("VoxelRegion repr: is VoxelRegion", "VoxelRegion" in rep)
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def main():
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"""Run all bulk operation tests"""
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print("=" * 60)
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print("VoxelGrid Bulk Operations Tests (Milestone 11)")
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print("=" * 60)
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print()
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test_fill_box_hollow_basic()
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print()
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test_fill_box_hollow_thick()
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print()
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test_fill_sphere_volume()
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print()
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test_fill_sphere_carve()
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print()
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test_fill_cylinder_volume()
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print()
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test_fill_cylinder_bounds()
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print()
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test_fill_noise_threshold()
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print()
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test_fill_noise_seed()
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print()
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test_copy_paste_basic()
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print()
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test_copy_paste_skip_air()
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print()
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test_copy_paste_overwrite()
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print()
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test_voxel_region_repr()
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print()
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print("=" * 60)
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print(f"Results: {passed} passed, {failed} failed")
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print("=" * 60)
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return 0 if failed == 0 else 1
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if __name__ == "__main__":
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sys.exit(main())
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