56 lines
1.6 KiB
Swift
56 lines
1.6 KiB
Swift
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// OrbitalCamera.swift
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// Blender-style orbit camera with pan, orbit, and dolly zoom.
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import Observation
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import simd
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@Observable
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final class OrbitalCamera {
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var azimuth: Float = Float.pi * 0.25
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var elevation: Float = Float.pi * 0.2
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var target: SIMD3<Float> = .zero
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var distance: Float = 7.0
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private let minDistance: Float = 0.5
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private let maxDistance: Float = 200.0
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private let minElevation: Float = -Float.pi * 0.49
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private let maxElevation: Float = Float.pi * 0.49
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var eye: SIMD3<Float> {
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let x = distance * cosf(elevation) * sinf(azimuth)
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let y = distance * sinf(elevation)
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let z = distance * cosf(elevation) * cosf(azimuth)
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return target + SIMD3<Float>(x, y, z)
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}
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var viewMatrix: simd_float4x4 {
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MathUtils.lookAt(eye: eye, center: target, up: SIMD3<Float>(0, 1, 0))
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}
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func orbit(deltaX: Float, deltaY: Float) {
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azimuth -= deltaX * 0.008
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elevation += deltaY * 0.008
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elevation = min(max(elevation, minElevation), maxElevation)
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}
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func pan(deltaX: Float, deltaY: Float) {
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let right = SIMD3<Float>(cosf(azimuth), 0, -sinf(azimuth))
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let up = SIMD3<Float>(0, 1, 0)
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let speed: Float = distance * 0.002
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target += right * (-deltaX * speed) + up * (deltaY * speed)
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}
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func zoom(scale: Float) {
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distance /= scale
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distance = min(max(distance, minDistance), maxDistance)
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}
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func reset() {
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azimuth = Float.pi * 0.25
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elevation = Float.pi * 0.2
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distance = 7.0
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target = .zero
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}
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}
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