src/viewer/scene/CameraControl/lib/CameraUpdater.js
import {math} from "../../math/math.js";
const SCALE_DOLLY_EACH_FRAME = 1; // Recalculate dolly speed for eye->target distance on each Nth frame
const EPSILON = 0.001;
const tempVec3 = math.vec3();
/**
* Handles camera updates on each "tick" that were scheduled by the various controllers.
*
* @private
*/
class CameraUpdater {
constructor(scene, controllers, configs, states, updates) {
this._scene = scene;
const camera = scene.camera;
const pickController = controllers.pickController;
const pivotController = controllers.pivotController;
const panController = controllers.panController;
let countDown = SCALE_DOLLY_EACH_FRAME; // Decrements on each tick
let dollyDistFactor = 1.0; // Calculated when countDown is zero
let followPointerWorldPos = null; // Holds the pointer's World position when configs.followPointer is true
this._onTick = scene.on("tick", () => {
if (!(configs.active && configs.pointerEnabled)) {
return;
}
let cursorType = "default";
//----------------------------------------------------------------------------------------------------------
// Dolly decay
//------------------------------------------------------------------------------------ ----------------------
if (Math.abs(updates.dollyDelta) < EPSILON) {
updates.dollyDelta = 0;
}
//----------------------------------------------------------------------------------------------------------
// Rotation decay
//----------------------------------------------------------------------------------------------------------
if (Math.abs(updates.rotateDeltaX) < EPSILON) {
updates.rotateDeltaX = 0;
}
if (Math.abs(updates.rotateDeltaY) < EPSILON) {
updates.rotateDeltaY = 0;
}
if (updates.rotateDeltaX !== 0 || updates.rotateDeltaY !== 0) {
updates.dollyDelta = 0;
}
//----------------------------------------------------------------------------------------------------------
// Dolly speed eye->look scaling
//
// If pointer is over an object, then dolly speed is proportional to the distance to that object.
//
// If pointer is not over an object, then dolly speed is proportional to the distance to the last
// object the pointer was over. This is so that we can dolly to structures that may have gaps through
// which empty background shows, that the pointer may inadvertently be over. In these cases, we don't
// want dolly speed wildly varying depending on how accurately the user avoids the gaps with the pointer.
//----------------------------------------------------------------------------------------------------------
if (configs.followPointer) {
if (--countDown <= 0) {
countDown = SCALE_DOLLY_EACH_FRAME;
if (updates.dollyDelta !== 0) {
if (updates.rotateDeltaY === 0 && updates.rotateDeltaX === 0) {
if (configs.followPointer && states.followPointerDirty) {
pickController.pickCursorPos = states.pointerCanvasPos;
pickController.schedulePickSurface = true;
pickController.update();
if (pickController.pickResult && pickController.pickResult.worldPos) {
followPointerWorldPos = pickController.pickResult.worldPos;
} else {
dollyDistFactor = 1.0;
followPointerWorldPos = null;
}
states.followPointerDirty = false;
}
}
if (followPointerWorldPos) {
const dist = Math.abs(math.lenVec3(math.subVec3(followPointerWorldPos, scene.camera.eye, tempVec3)));
dollyDistFactor = dist / configs.dollyProximityThreshold;
}
if (dollyDistFactor < configs.dollyMinSpeed) {
dollyDistFactor = configs.dollyMinSpeed;
}
}
}
} else {
dollyDistFactor = 1;
followPointerWorldPos = null;
}
const dollyDeltaForDist = (updates.dollyDelta * dollyDistFactor);
//----------------------------------------------------------------------------------------------------------
// Rotation
//----------------------------------------------------------------------------------------------------------
if (updates.rotateDeltaY !== 0 || updates.rotateDeltaX !== 0) {
if ((!configs.firstPerson) && configs.followPointer && pivotController.getPivoting()) {
pivotController.continuePivot(updates.rotateDeltaY, updates.rotateDeltaX);
pivotController.showPivot();
} else {
if (updates.rotateDeltaX !== 0) {
if (configs.firstPerson) {
camera.pitch(-updates.rotateDeltaX);
} else {
camera.orbitPitch(updates.rotateDeltaX);
}
}
if (updates.rotateDeltaY !== 0) {
if (configs.firstPerson) {
camera.yaw(updates.rotateDeltaY);
} else {
camera.orbitYaw(updates.rotateDeltaY);
}
}
}
updates.rotateDeltaX *= configs.rotationInertia;
updates.rotateDeltaY *= configs.rotationInertia;
cursorType = "grabbing";
}
//----------------------------------------------------------------------------------------------------------
// Panning
//----------------------------------------------------------------------------------------------------------
if (Math.abs(updates.panDeltaX) < EPSILON) {
updates.panDeltaX = 0;
}
if (Math.abs(updates.panDeltaY) < EPSILON) {
updates.panDeltaY = 0;
}
if (Math.abs(updates.panDeltaZ) < EPSILON) {
updates.panDeltaZ = 0;
}
if (updates.panDeltaX !== 0 || updates.panDeltaY !== 0 || updates.panDeltaZ !== 0) {
const vec = math.vec3();
vec[0] = updates.panDeltaX;
vec[1] = updates.panDeltaY;
vec[2] = updates.panDeltaZ;
let verticalEye;
let verticalLook;
if (configs.constrainVertical) {
if (camera.xUp) {
verticalEye = camera.eye[0];
verticalLook = camera.look[0];
} else if (camera.yUp) {
verticalEye = camera.eye[1];
verticalLook = camera.look[1];
} else if (camera.zUp) {
verticalEye = camera.eye[2];
verticalLook = camera.look[2];
}
camera.pan(vec);
const eye = camera.eye;
const look = camera.look;
if (camera.xUp) {
eye[0] = verticalEye;
look[0] = verticalLook;
} else if (camera.yUp) {
eye[1] = verticalEye;
look[1] = verticalLook;
} else if (camera.zUp) {
eye[2] = verticalEye;
look[2] = verticalLook;
}
camera.eye = eye;
camera.look = look;
} else {
camera.pan(vec);
}
cursorType = "grabbing";
}
updates.panDeltaX *= configs.panInertia;
updates.panDeltaY *= configs.panInertia;
updates.panDeltaZ *= configs.panInertia;
//----------------------------------------------------------------------------------------------------------
// Dollying
//----------------------------------------------------------------------------------------------------------
if (dollyDeltaForDist !== 0) {
if (dollyDeltaForDist < 0) {
cursorType = "zoom-in";
} else {
cursorType = "zoom-out";
}
if (configs.firstPerson) {
let verticalEye;
let verticalLook;
if (configs.constrainVertical) {
if (camera.xUp) {
verticalEye = camera.eye[0];
verticalLook = camera.look[0];
} else if (camera.yUp) {
verticalEye = camera.eye[1];
verticalLook = camera.look[1];
} else if (camera.zUp) {
verticalEye = camera.eye[2];
verticalLook = camera.look[2];
}
}
if (configs.followPointer) {
const dolliedThroughSurface = panController.dollyToCanvasPos(followPointerWorldPos, states.pointerCanvasPos, -dollyDeltaForDist);
if (dolliedThroughSurface) {
states.followPointerDirty = true;
}
} else {
camera.pan([0, 0, dollyDeltaForDist]);
camera.ortho.scale = camera.ortho.scale - dollyDeltaForDist;
}
if (configs.constrainVertical) {
const eye = camera.eye;
const look = camera.look;
if (camera.xUp) {
eye[0] = verticalEye;
look[0] = verticalLook;
} else if (camera.yUp) {
eye[1] = verticalEye;
look[1] = verticalLook;
} else if (camera.zUp) {
eye[2] = verticalEye;
look[2] = verticalLook;
}
camera.eye = eye;
camera.look = look;
}
} else if (configs.planView) {
if (configs.followPointer) {
const dolliedThroughSurface = panController.dollyToCanvasPos(followPointerWorldPos, states.pointerCanvasPos, -dollyDeltaForDist);
if (dolliedThroughSurface) {
states.followPointerDirty = true;
}
} else {
camera.ortho.scale = camera.ortho.scale + dollyDeltaForDist;
camera.zoom(dollyDeltaForDist);
}
} else { // Orbiting
if (configs.followPointer) {
const dolliedThroughSurface = panController.dollyToCanvasPos(followPointerWorldPos, states.pointerCanvasPos, -dollyDeltaForDist);
if (dolliedThroughSurface) {
states.followPointerDirty = true;
}
} else {
camera.ortho.scale = camera.ortho.scale + dollyDeltaForDist;
camera.zoom(dollyDeltaForDist);
}
}
updates.dollyDelta *= configs.dollyInertia;
}
pickController.fireEvents();
document.body.style.cursor = cursorType;
});
}
destroy() {
this._scene.off(this._onTick);
}
}
export {CameraUpdater};
