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//
// RenderController.swift
// ShedCalc
//
// Created by Jacky Jack on 28/07/2026.
//
import SwiftUI
import RealityKit
let BEAM_2x4_WIDTH: Float = 0.02
let BEAM_2x4_LENGTH: Float = 0.04
struct BeamData {
let id: String
let position: SIMD3<Float>
let height: Float
let rotation: SIMD3<Float>
}
class RenderController {
func createScene(dimensions: SIMD3<Float>, rotation: SIMD2<Float>) -> Entity {
let scene = Entity()
scene.name = "scene"
let box = createBox(dimensions: [1,1,1])
scene.addChild(box)
let beam0 = createBeam2x4(position: [1,1,0], height: 2.4, rotate: [90,0,0], id: "beam0")
scene.addChild(beam0)
//let beam1 = createBeam2x4(position: [1,0,0], height: 2.4, rotate: [0,0,0], id: "beam1")
//scene.addChild(beam1)
//let beam2 = createBeam2x4(position: [1,1,0], height: 2.4, rotate: [0,0,90], id: "beam2") //Z-around beam
//scene.addChild(beam2)
//let beam3 = createBeam2x4(position: [1,1,0], height: 2.4, rotate: [0,90,0], id: "beam3")
//scene.addChild(beam3)
let ground = createGround()
scene.addChild(ground)
return scene
}
func createLights() -> (DirectionalLight, PointLight) {
let directional = DirectionalLight()
directional.light.intensity = 2000
directional.look(at: .zero, from: [2, 4, 3], relativeTo: nil)
let point = PointLight()
point.light.intensity = 5000
point.position = [-2, 2, -2]
return (directional, point)
}
func createCamera() -> PerspectiveCamera {
let camera = PerspectiveCamera()
camera.camera.fieldOfViewInDegrees = 60
camera.position = [0,1,5]
camera.look(at: .zero, from: camera.position, relativeTo: nil)
return camera
}
// MARK: - Gesture Handling
func handleDragGesture(
_ value: DragGesture.Value,
lastDrag: CGSize,
currentRotation: SIMD2<Float>
) -> (rotation: SIMD2<Float>, drag: CGSize) {
let dx = Float(value.translation.width - lastDrag.width) * 0.01
let dy = Float(value.translation.height - lastDrag.height) * 0.01
let newRotation = SIMD2<Float>(
currentRotation.x + dy,
currentRotation.y + dx
)
return (rotation: newRotation, drag: value.translation)
}
// MARK: - Private Helpers
private func createBox(dimensions: SIMD3<Float>) -> ModelEntity {
let box = ModelEntity(
mesh: .generateBox(size: dimensions, cornerRadius: 0.02),
materials: [SimpleMaterial(color: .yellow, isMetallic: false)]
)
box.position = [0,0,0]
box.name = "box"
return box
}
private func createBeam2x4(position: SIMD3<Float>, height: Float, rotate: SIMD3<Float>, id: String) -> ModelEntity {
let box = ModelEntity(
mesh: .generateBox(size: SIMD3(BEAM_2x4_WIDTH,BEAM_2x4_LENGTH,height), cornerRadius: 0.02),
materials: [SimpleMaterial(color: .yellow, isMetallic: false)]
)
//box.look(at: position, from: lookFrom, relativeTo: nil)
//box.setOrientation(.init(eulerAngles: lookFrom), relativeTo: nil)
box.position = position
// Create individual axis rotations
let pitch = simd_quatf(angle: Float.pi*rotate.x/180.0, axis: [1, 0, 0]) // X-axis
let yaw = simd_quatf(angle: Float.pi*rotate.y/180.0, axis: [0, 1, 0]) // Y-axis
let roll = simd_quatf(angle: Float.pi*rotate.z/180.0, axis: [0, 0, 1]) // Z-axis
// Combine rotations (order matters: usually yaw * pitch * roll)
box.transform.rotation = yaw * pitch * roll
box.name = "beam-\(id)"
return box
}
func generateShedWall(position: SIMD3<Float>, height: Float, widthNum: Int, lengthNum: Int, spaceBeem: Float) -> [BeamData] {
var beams: [BeamData] = []
var id: Int = 0
//Wall 0
for i in 0...widthNum {
let x0 = Float(i)*spaceBeem
beams.append(BeamData(id: "beam\(id)", position: [x0,position.y, position.z], height: height, rotation: [90,0,0]))
id += 1
}
//Wall 1
//Wall 2
//Wall 3
return beams
}
func createBeams(_ beams: [BeamData]) -> [ModelEntity] {
return beams.map { beam in
createBeam2x4(position: beam.position, height: beam.height, rotate: beam.rotation, id: beam.id)
}
}
private func createGround() -> ModelEntity {
let ground = ModelEntity(
mesh: .generatePlane(width: 10, depth: 10),
materials: [UnlitMaterial(color: .green)]
)
ground.position.y = -0.5
return ground
}
}
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