Portal & Particle

Index Portal Particles

Portal Room-Portal visibility system  Determine which room is shown at this time  Determine which object is shown at this time

Portal (cont.) Portal Generation  By Designer Primitives  NiRoomGroup  NiRoom  Convex Region  NiRoom::Wall  NiPortal  Fixtures and Shell

Portal (cont.) Rooms Convex Region Components  Walls, Fixtures, Portals if the current room is being visited then return to calling room else mark the current room as being visited for each portal in the room test the portal against the current view rectangle if the portal is visible then downsize the view rectangle to bound the portal and recursively process the adjoining room end for process the current room's fixtures mark the current room as not being visited return to calling room

Portal (cont.) Portals “room” to “adjoiner”  Represent a way of seeing from a part of a scene graph “through” a polygon to another part of a scene graph Making “View Frustum” smaller

Portal (cont.) Walls

Portal (cont.) Fixtures Objects in a Room

Portal (cont.)

Portal (cont.) Design Strategy

Portal (cont.) Collision Detection Collision Detection pkRoomGroup->WhichRoom(pkObject->GetWorldBound().GetCenter())

Portal (cont.) Class Details NiPortal  *_NDLPR NiRoom  *_NDLRM  NiRoom::Wall - _NDLWL NiRoomGroup  *_NDLRG  Sorting with accumulator, Shell NiFixtureCuller  NiCullingProcess  Avoid Multiple Render with Map

Particle System Overview NiParticleSystem NiTimeControllerNiPSysModifierNiProperty 1 * 1 * 1 *

Particles (cont.) World Space Particles Model Space Particles Mesh Particle  Sprite-Based Particles  Pools for Reusing  Classes  NiMeshParticleSystem  NiMeshPSysData  NiPSysMeshUpdateModifier

Particles (cont.) Modifier Order Flags enum { ORDER_KILLOLDPARTICLES = 0, ORDER_EMITTER = 1000, ORDER_SPAWN = 2000, ORDER_GENERAL = 3000, ORDER_FORCE = 4000, ORDER_COLLIDER = 5000, ORDER_POSUPDATE = 6000, ORDER_POSTPOSUPDATE = 6500, ORDER_BOUNDUPDATE = 7000 };

Particles (cont.) Required Modifiers ModifierDescription NiPSysAgeDeath Modifier Updates the age of each particle, killing off particles whose age exceeds their life span. Also provides an option to spawn new particles upon death. NiPSysBoundUpd ateModifier Updates the bounding volume around the set of particles. Also provides an option to skip frames between bound updates. NiPSysMeshUpda teModifier Updates mesh particles using each particle's age as the time passed into the Update call. Also initializes new particles to have the proper mesh type. Only required for mesh particle systems. NiPSysPositionMo difier Updates the position of each particle based on its velocity and the time elapsed since its last update. NiPSysRotationM odifier Updates the rotation of each particle around its rotation axis.

Particles (cont.) Common Optional Modifiers ModifierDescription NiPSysColorModifierChanges the color of each particle over its lifetime. NiPSysEmitterCreates new particles. NiPSysEmitter is an abstract base class for a variety of particle emitters.NiPSysEmitter NiPSysGrowFadeModifierSmoothly changes the size of each particle so that it grows or fades over its lifetime. NiPSysSpawnModifierUsed to spawn new particles using information from an existing particle.

Particles (cont.) Force Modifier ModifierDescription NiPSysBombModifierExerts an explosive force over a specified period of time. NiPSysDragFieldModifierExerts a drag force over some specified field. Most closely matches the drag force in Maya. NiPSysDragModifierExerts a drag force on particles. Most closely matches the drag force in 3ds max. NiPSysGravityModifierGravity force for particles with specified strength, position, and direction. NiPSysFieldModifierBase class for all field modifiers includes magnitude, attenuation and max distance

Particles (cont.) Force Modifiers (cont.) ModifierDescription NiPSysGravityFieldModifier Exerts a directional gravity field with specified magnitude, position and direction. NiPSysRaidalFieldModifierExerts a point gravity field with specified magnitude and position. NiPSysVortexFieldModifierExerts a rotational force around the directional axis of the vortex. NiPSysAirFieldModifierAccelerates particles up to the magnitude of the air field, creates wind, fan, or wake effects. NiPSysTurbulenceFieldModifierExerts a turbulent field force.

Particles (cont.) Particle Colliders  NiPSysColliderManager  Collection of NiPSysCollider  NiPSysPlanarCollider  NiPSysSphericalCollider

Particles (cont.) Particle System Time Controllers Time ControllerDescription NiPSysUpdateCtlrCalls UpdateSystem on the NiParticleSystem object, passing it the current time. This is what updates the particle system, so it is critical that this controller be attached to the NiParticleSystem object. It ensures when it is attached that it is the last controller that is updated, allowing the other controllers to change modifier parameters before the modifiers are updated by UpdateSystem.NiParticleSystem NiPSysEmitterCtlrIf the particle system contains an NiPSysEmitter modifier, this controller is necessary in order for any particles to be emitted. It stores animation keys for the rate of emission and for whether or not the emitter is active.NiPSysEmitter

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