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86 lines
2.9 KiB
Lua
86 lines
2.9 KiB
Lua
--
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--
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-- Copyright (c) Contributors to the Open 3D Engine Project.
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-- For complete copyright and license terms please see the LICENSE at the root of this distribution.
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--
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-- SPDX-License-Identifier: Apache-2.0 OR MIT
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--
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--
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local EntityLookAt =
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{
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Properties =
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{
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EntityTargetToFace = {default=EntityId()},
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Advanced = {default="Edit this script to face a different axis towards the target"},
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},
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Handlers =
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{
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MyTransform = {},
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TargetTransform = {},
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}
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}
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function EntityLookAt:OnActivate()
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if self.Properties.EntityTargetToFace:IsValid() then
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-- cache properties
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local myTM = TransformBus.Event.GetWorldTM(self.entityId)
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self.myPos = myTM:GetPosition()
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self.targetPos = TransformBus.Event.GetWorldTranslation(self.Properties.EntityTargetToFace)
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self.myScale = myTM:RetrieveScale()
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self.readyForRotation = true
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--attach handlers
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self.myTransform = TransformNotificationBus.Connect(self.Handlers.MyTransform, self.entityId)
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self.targetTransform = TransformNotificationBus.Connect(self.Handlers.TargetTransform, self.Properties.EntityTargetToFace)
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self.Handlers.MyTransform.parent = self
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self.Handlers.TargetTransform.parent = self
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self:UpdateFacing()
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end
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end
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function EntityLookAt.Handlers.TargetTransform:OnTransformChanged(localTM, worldTM)
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local distance = self.parent.targetPos - worldTM:GetPosition()
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-- if our target has moved, Update our facing
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if not distance:IsZero(0.0001) then
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self.parent.targetPos = worldTM:GetPosition()
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self.parent:UpdateFacing()
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end
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end
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function EntityLookAt.Handlers.MyTransform:OnTransformChanged(localTM, worldTM)
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-- cache the scale
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self.parent.myScale = worldTM:RetrieveScale()
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local distance = self.parent.myPos - worldTM:GetPosition()
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-- if we've moved then update our facing
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if self.parent.readyForRotation then
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self.parent.myPos = worldTM:GetPosition()
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self.parent:UpdateFacing()
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end
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end
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function EntityLookAt:UpdateFacing()
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self.readyForRotation = false
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-- you can use Model Space relative AxisType's of
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-- YPositive : face directly at targetPos,
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-- YNegative : face directly away from targetPos,
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-- XPositive : "right shoulder" faces targetPos,
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-- XNegative : "left shoulder" faces targetPos,
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-- ZPositive : top faces targetPos
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-- ZNegative : bottom faces targetPos
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self.axisToFaceAtTarget = AxisType.YPositive
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local tm = MathUtils.CreateLookAt(self.myPos, self.targetPos, self.axisToFaceAtTarget)
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tm:MultiplyByScale(self.myScale)
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TransformBus.Event.SetWorldTM(self.entityId, tm)
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self.readyForRotation = true
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end
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function EntityLookAt:OnDeactivate()
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self.Handlers.MyTransform = {}
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self.Handlers.TargetTransform = {}
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self.myTransform = nil
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self.targetTransform = nil
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end
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return EntityLookAt
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