Class TPhysicsProperties
Unit
CastleTransform
Declaration
type TPhysicsProperties = class(TComponent)
Description
Configure physics simulation calculation.
Hierarchy
- TObject
- TPersistent
- TComponent
- TPhysicsProperties
Overview
Fields
Methods
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constructor Create(AOwner: TComponent); override; |
Properties
Description
Fields
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nested const DefaultAngularVelocityRK4Integration = false; |
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nested const DefaultLinearVelocityRK4Integration = false; |
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nested const DefaultFrequency = 60.0; |
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nested const DefaultMaxPhysicsTicksPerUpdate = 5; |
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nested const DefaultGravityStrength = 9.81; |
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Methods
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constructor Create(AOwner: TComponent); override; |
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Properties
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property AngularVelocityRK4Integration: Boolean read FAngularVelocityRK4Integration write SetAngularVelocityRK4Integration default DefaultAngularVelocityRK4Integration; |
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Use a more precise (but also more expensive) method for simulating angular velocity. The "RK4" refers to Runge–Kutta method.
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property LinearVelocityRK4Integration: Boolean read FLinearVelocityRK4Integration write SetLinearVelocityRK4Integration default DefaultLinearVelocityRK4Integration; |
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Use a more precise (but also more expensive) method for simulating linear velocity. The "RK4" refers to Runge–Kutta method.
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property Frequency: Single read FFrequency write SetFrequency default DefaultFrequency; |
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How often should the physics simulation run in a second. Larger values increase accuracy (up to a certain point), but also increase the CPU overhead.
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property GravityStrength: Single read FGravityStrength write FGravityStrength default DefaultGravityStrength; |
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Physics gravity is set using the -GravityUp vector (from main camera) multiplied with GravityStrength.
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property MaxPhysicsTicksPerUpdate: Cardinal read FMaxPhysicsTicksPerUpdate write FMaxPhysicsTicksPerUpdate default DefaultMaxPhysicsTicksPerUpdate; |
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Non-zero value avoids the "spiral of death" when the physics takes a long time to calculate.
When the value is zero, physics makes always as many steps as necessary, to advance the time by 1 / Frequency steps. This means that if physics takes a long time to calculate, next time it will take even longer time to calculate (it will need more steps), thus we have a "spiral of death" that leads to lower and lower FPS.
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