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| 1 | +package io.github.sceneview.sample.modelviewer.compose.cameramanipulator |
| 2 | + |
| 3 | +import android.os.Bundle |
| 4 | +import androidx.activity.ComponentActivity |
| 5 | +import androidx.activity.compose.setContent |
| 6 | +import androidx.compose.foundation.Image |
| 7 | +import androidx.compose.foundation.background |
| 8 | +import androidx.compose.foundation.layout.Box |
| 9 | +import androidx.compose.foundation.layout.fillMaxSize |
| 10 | +import androidx.compose.foundation.layout.navigationBarsPadding |
| 11 | +import androidx.compose.foundation.layout.padding |
| 12 | +import androidx.compose.foundation.layout.width |
| 13 | +import androidx.compose.material3.ExperimentalMaterial3Api |
| 14 | +import androidx.compose.material3.MaterialTheme |
| 15 | +import androidx.compose.material3.Text |
| 16 | +import androidx.compose.material3.TopAppBar |
| 17 | +import androidx.compose.material3.TopAppBarDefaults |
| 18 | +import androidx.compose.ui.Alignment |
| 19 | +import androidx.compose.ui.Modifier |
| 20 | +import androidx.compose.ui.res.painterResource |
| 21 | +import androidx.compose.ui.res.stringResource |
| 22 | +import androidx.compose.ui.unit.dp |
| 23 | +import io.github.sceneview.Scene |
| 24 | +import io.github.sceneview.collision.CollisionSystem |
| 25 | +import io.github.sceneview.gesture.CameraGestureDetector |
| 26 | +import io.github.sceneview.math.Position |
| 27 | +import io.github.sceneview.math.toVector3 |
| 28 | +import io.github.sceneview.node.CameraNode |
| 29 | +import io.github.sceneview.node.ModelNode |
| 30 | +import io.github.sceneview.rememberCameraManipulator |
| 31 | +import io.github.sceneview.rememberCameraNode |
| 32 | +import io.github.sceneview.rememberCollisionSystem |
| 33 | +import io.github.sceneview.rememberEngine |
| 34 | +import io.github.sceneview.rememberEnvironmentLoader |
| 35 | +import io.github.sceneview.rememberModelLoader |
| 36 | +import io.github.sceneview.rememberNode |
| 37 | +import io.github.sceneview.rememberOnGestureListener |
| 38 | +import io.github.sceneview.rememberView |
| 39 | +import io.github.sceneview.sample.SceneviewTheme |
| 40 | +import kotlin.math.sign |
| 41 | + |
| 42 | +class MainActivity : ComponentActivity() { |
| 43 | + |
| 44 | + @OptIn(ExperimentalMaterial3Api::class) |
| 45 | + override fun onCreate(savedInstanceState: Bundle?) { |
| 46 | + super.onCreate(savedInstanceState) |
| 47 | + |
| 48 | + setContent { |
| 49 | + SceneviewTheme { |
| 50 | + Box(modifier = Modifier.fillMaxSize()) { |
| 51 | + val engine = rememberEngine() |
| 52 | + val modelLoader = rememberModelLoader(engine) |
| 53 | + val environmentLoader = rememberEnvironmentLoader(engine) |
| 54 | + val view = rememberView(engine) |
| 55 | + val collisionSystem = rememberCollisionSystem(view) |
| 56 | + |
| 57 | + val centerNode = rememberNode(engine) |
| 58 | + |
| 59 | + val cameraNode = rememberCameraNode(engine) { |
| 60 | + position = Position(y = -0.5f, z = 2.0f) |
| 61 | + lookAt(centerNode) |
| 62 | + centerNode.addChildNode(this) |
| 63 | + } |
| 64 | + |
| 65 | + val cameraManipulator = rememberCameraManipulator( |
| 66 | + creator = { |
| 67 | + AdvancedCameraManipulator( |
| 68 | + cameraNode = cameraNode, |
| 69 | + collisionSystem = collisionSystem, |
| 70 | + orbitHomePosition = cameraNode.worldPosition, |
| 71 | + targetPosition = centerNode.worldPosition |
| 72 | + ) |
| 73 | + } |
| 74 | + ) |
| 75 | + |
| 76 | + Scene( |
| 77 | + modifier = Modifier.fillMaxSize(), |
| 78 | + engine = engine, |
| 79 | + modelLoader = modelLoader, |
| 80 | + view = view, |
| 81 | + cameraNode = cameraNode, |
| 82 | + cameraManipulator = cameraManipulator, |
| 83 | + childNodes = listOf(centerNode, |
| 84 | + rememberNode { |
| 85 | + ModelNode( |
| 86 | + modelInstance = modelLoader.createModelInstance( |
| 87 | + assetFileLocation = "models/damaged_helmet.glb" |
| 88 | + ), |
| 89 | + scaleToUnits = 0.25f |
| 90 | + ) |
| 91 | + }), |
| 92 | + collisionSystem = collisionSystem, |
| 93 | + environment = environmentLoader.createHDREnvironment( |
| 94 | + assetFileLocation = "environments/sky_2k.hdr" |
| 95 | + )!!, |
| 96 | + onGestureListener = rememberOnGestureListener( |
| 97 | + onDoubleTap = { _, node -> |
| 98 | + node?.apply { |
| 99 | + scale *= 2.0f |
| 100 | + } |
| 101 | + } |
| 102 | + ) |
| 103 | + ) |
| 104 | + Image( |
| 105 | + modifier = Modifier |
| 106 | + .width(192.dp) |
| 107 | + .align(Alignment.BottomEnd) |
| 108 | + .navigationBarsPadding() |
| 109 | + .padding(16.dp) |
| 110 | + .background( |
| 111 | + color = MaterialTheme.colorScheme.primaryContainer.copy( |
| 112 | + alpha = 0.5f |
| 113 | + ), |
| 114 | + shape = MaterialTheme.shapes.medium |
| 115 | + ) |
| 116 | + .padding(8.dp), |
| 117 | + painter = painterResource(id = R.drawable.logo), |
| 118 | + contentDescription = "Logo" |
| 119 | + ) |
| 120 | + TopAppBar( |
| 121 | + title = { |
| 122 | + Text( |
| 123 | + text = stringResource(id = R.string.app_name) |
| 124 | + ) |
| 125 | + }, |
| 126 | + colors = TopAppBarDefaults.topAppBarColors( |
| 127 | + containerColor = MaterialTheme.colorScheme.primary.copy(alpha = 0.25f), |
| 128 | + titleContentColor = MaterialTheme.colorScheme.onPrimary |
| 129 | + |
| 130 | + ) |
| 131 | + ) |
| 132 | + } |
| 133 | + } |
| 134 | + } |
| 135 | + } |
| 136 | +} |
| 137 | + |
| 138 | +/** |
| 139 | + * Override default camera manipulator to achieve relative zooming based on distance from camera to |
| 140 | + * target and separation between two fingers. |
| 141 | + * |
| 142 | + * Target is calculated as closest node to center of finger's position in direction of camera. |
| 143 | + */ |
| 144 | +class AdvancedCameraManipulator( |
| 145 | + private val cameraNode: CameraNode, |
| 146 | + private val collisionSystem: CollisionSystem, |
| 147 | + orbitHomePosition: Position? = null, |
| 148 | + targetPosition: Position? = null |
| 149 | +): CameraGestureDetector.DefaultCameraManipulator( |
| 150 | + orbitHomePosition = orbitHomePosition, |
| 151 | + targetPosition = targetPosition |
| 152 | +) { |
| 153 | + private var scrollBeginCameraPosition = Position() |
| 154 | + private var scrollBeginDistance: Float? = 0f |
| 155 | + private var scrollBeginSeparation = 0f |
| 156 | + |
| 157 | + override fun scrollBegin(x: Int, y: Int, separation: Float) { |
| 158 | + val hitResults = collisionSystem.hitTest(x.toFloat(), y.toFloat()) |
| 159 | + scrollBeginDistance = hitResults.firstOrNull()?.node?.position?.let { |
| 160 | + (cameraNode.position - it).toVector3().length() |
| 161 | + } |
| 162 | + scrollBeginCameraPosition = cameraNode.position |
| 163 | + scrollBeginSeparation = separation |
| 164 | + } |
| 165 | + |
| 166 | + override fun scrollUpdate(x: Int, y: Int, prevSeparation: Float, currSeparation: Float) { |
| 167 | + val beginDistance = scrollBeginDistance |
| 168 | + if (beginDistance == null) { |
| 169 | + super.scrollUpdate(x, y, prevSeparation, currSeparation) |
| 170 | + return |
| 171 | + } |
| 172 | + |
| 173 | + val movedVector = (cameraNode.position - scrollBeginCameraPosition).toVector3() |
| 174 | + val movedDirection = listOf( |
| 175 | + movedVector.x.sign, |
| 176 | + movedVector.y.sign, |
| 177 | + movedVector.z.sign, |
| 178 | + ).firstOrNull { it != 0f }?.sign ?: 1f |
| 179 | + |
| 180 | + val ratio = scrollBeginSeparation / currSeparation |
| 181 | + val moved = movedVector.length() * movedDirection |
| 182 | + val target = (beginDistance * ratio) |
| 183 | + val adjust = target - (beginDistance - moved) |
| 184 | + |
| 185 | + manipulator.scroll(x, y, adjust) |
| 186 | + } |
| 187 | +} |
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