Luke The Dev
28 lines
1.2 KiB
JavaScript
28 lines
1.2 KiB
JavaScript
async function main() {
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const THREE = await import("three");
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const target = new THREE.Vector3(0, 0, 1);
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const v = new THREE.Vector3(-0.42, 1.32, -1.47).normalize();
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// We want to find a rotation of the earth group (with order XYZ or YXZ).
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// that brings v to target.
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// But the earth might have arbitrary rotations.
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// we want to rotate earth such that earth.localToWorld(v) == target.
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// so earth.quaternion * v = target.
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// earth.quaternion = quaternion that rotates v to target.
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const q = new THREE.Quaternion().setFromUnitVectors(v, target);
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const e = new THREE.Euler().setFromQuaternion(q, "XYZ");
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console.log("To point exactly at +Z:");
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console.log("x:", e.x, "y:", e.y, "z:", e.z);
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// Since the camera is looking slightly down/up, maybe we need to pitch it.
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const cameraDir = new THREE.Vector3(0, 0.8 - 0.5, -0.5 - 2.05).normalize().negate(); // Vector from surface to camera.
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console.log("Camera dir:", cameraDir);
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const q2 = new THREE.Quaternion().setFromUnitVectors(v, cameraDir);
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const e2 = new THREE.Euler().setFromQuaternion(q2, "XYZ");
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console.log("To point at camera:");
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console.log("x:", e2.x, "y:", e2.y, "z:", e2.z);
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}
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void main();
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