kayjaydee
8d868a28ca
- Vec3.lerp(other, t) for linear interpolation between two points - ParticleTrail.sample(from, to, density) emits density-based interpolated points strictly between endpoints (endpoints excluded by construction) - TRAIL_DENSITY = 4.0 particles per block - 6 ParticleTrail tests + 3 Vec3.lerp tests, all green - Zero Hytale imports — chain/ frontier preserved
75 lines
2.1 KiB
Java
75 lines
2.1 KiB
Java
package com.mythlane.chainlightning.chain;
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import org.junit.jupiter.api.Test;
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import static org.junit.jupiter.api.Assertions.assertEquals;
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import static org.junit.jupiter.api.Assertions.assertTrue;
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final class Vec3Test {
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@Test
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void distanceSquared_zeroToZero_isZero() {
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Vec3 a = new Vec3(0, 0, 0);
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assertEquals(0.0, a.distanceSquared(a), 1e-9);
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}
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@Test
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void distanceSquared_pythagorean345_is25() {
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Vec3 a = new Vec3(0, 0, 0);
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Vec3 b = new Vec3(3, 4, 0);
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assertEquals(25.0, a.distanceSquared(b), 1e-9);
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}
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@Test
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void distanceSquared_isCommutative() {
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Vec3 a = new Vec3(1, 2, 3);
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Vec3 b = new Vec3(-4, 5, 6);
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assertEquals(a.distanceSquared(b), b.distanceSquared(a), 1e-9);
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}
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@Test
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void distance_pythagorean345_is5() {
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Vec3 a = new Vec3(0, 0, 0);
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Vec3 b = new Vec3(3, 4, 0);
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assertEquals(5.0, a.distance(b), 1e-9);
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}
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@Test
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void distanceSquared_negativeCoordinates_works() {
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Vec3 a = new Vec3(-1, -1, -1);
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Vec3 b = new Vec3(1, 1, 1);
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assertEquals(12.0, a.distanceSquared(b), 1e-9);
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assertTrue(a.distance(b) > 3.4 && a.distance(b) < 3.5);
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}
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@Test
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void lerpAtZeroReturnsFrom() {
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Vec3 from = Vec3.ZERO;
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Vec3 to = new Vec3(10, 10, 10);
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Vec3 result = from.lerp(to, 0.0);
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assertEquals(from.x(), result.x(), 1e-9);
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assertEquals(from.y(), result.y(), 1e-9);
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assertEquals(from.z(), result.z(), 1e-9);
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}
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@Test
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void lerpAtOneReturnsTo() {
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Vec3 from = Vec3.ZERO;
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Vec3 to = new Vec3(10, 10, 10);
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Vec3 result = from.lerp(to, 1.0);
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assertEquals(to.x(), result.x(), 1e-9);
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assertEquals(to.y(), result.y(), 1e-9);
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assertEquals(to.z(), result.z(), 1e-9);
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}
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@Test
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void lerpAtHalfReturnsMidpoint() {
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Vec3 from = new Vec3(0, 0, 0);
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Vec3 to = new Vec3(10, 0, 0);
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Vec3 result = from.lerp(to, 0.5);
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assertEquals(5.0, result.x(), 1e-9);
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assertEquals(0.0, result.y(), 1e-9);
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assertEquals(0.0, result.z(), 1e-9);
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}
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}
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