46 lines
1.4 KiB
JavaScript
46 lines
1.4 KiB
JavaScript
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GameLib.D3.ComponentLookAt = function(
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componentId,
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targetEntity
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) {
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this.componentId = componentId || GameLib.D3.Tools.RandomId();
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this.parentEntity = null;
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// Todo: this should be executed somewhere in game-lib-z, so that we don't execute it on every construction of an object.
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GameLib.D3.Utils.Extend(GameLib.D3.ComponentLookAt, GameLib.D3.ComponentInterface);
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//
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this.targetEntity = targetEntity;
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};
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///////////////////////// Methods to override //////////////////////////
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GameLib.D3.ComponentLookAt.prototype.onUpdate = function(
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deltaTime,
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parentEntity
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) {
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if(this.targetEntity) {
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var target = this.targetEntity.position;
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var lookAtMatrix = new THREE.Matrix4().lookAt(
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new THREE.Vector3(
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parentEntity.position.x,
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parentEntity.position.y,
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parentEntity.position.z
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),
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new THREE.Vector3(
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target.x,
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target.y,
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target.z
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),
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new THREE.Vector3(
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0,
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1,
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0
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)
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);
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var quaternion = new THREE.Quaternion().setFromRotationMatrix(lookAtMatrix);
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this.parentEntity.quaternion.x = quaternion.x;
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this.parentEntity.quaternion.y = quaternion.y;
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this.parentEntity.quaternion.z = quaternion.z;
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this.parentEntity.quaternion.w = quaternion.w;
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}
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};
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