A3DGE - Amateur 3D Game Engine

Class Hierarchy

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Functions and Procedures

Class TObject3D

Fields

Unit

Declaration

type TObject3D = class(TEntity3D)

Description

Base for objects.

Hierarchy

TObject
TEntity3D
TObject3D

Overview

Methods

	`procedure SetPosition (aVector: TVector3D); override;`
	`procedure SetScale (aVector: TVector3D); virtual;`
	`CONSTRUCTOR Create; override;`
	`FUNCTION CheckCollision (CONST aObject: TObject3D): BOOLEAN;`
	`PROCEDURE Render;`
	`PROCEDURE RenderBoundingVolume;`

Properties

	`property Id: LONGINT READ fId WRITE fId;`
	`property Visible: BOOLEAN READ fVisible WRITE fVisible;`
	`property Frame: Real read fFrame write fFrame;`
	`property Model: TModel3D READ fModel WRITE fModel;`
	`property Scaled: Boolean read fDoScale;`
	`property Scale: TVector3D READ fScale write SetScale;`
	`property Radius: GLfloat READ fRadius WRITE fRadius;`
	`property UseBoundingBox: BOOLEAN READ fUseBoundingBox WRITE fUseBoundingBox;`
	`property BoundingBox: TBox read fBoundingBox write SetBoundingBox;`
	`property NextObject: TObject3D READ fNext WRITE fNext;`
	`property OnCollision: TNotifyObject3DEvent read fOnCollision write fOnCollision;`

Description

Methods

procedure SetPosition (aVector: TVector3D); override;

Change position.

See also

TEntity3D.Position: Entity position.

procedure SetScale (aVector: TVector3D); virtual;

Change scale.

See also

TObject3D.Scale: Applied scale.

	`CONSTRUCTOR Create; override;`
Creates an empty object.

FUNCTION CheckCollision (CONST aObject: TObject3D): BOOLEAN;

Check if object collided with another object.

To check the collision, this method uses both bounding sphere and bounding boxes where available. It follows the next sequence:

It checks sphere collision using both object Radius.
If spheres collide, then checks box collision if they're available.

Note that if any of the Radius is zero or negative, it will skip any checking and return False.

Parameters

aObject: The object to check the collision with.

Returns

True if objects are in contact or overlap, False otherwise.

See also

TObject3D.Radius: Bounding sphere radius.
TObject3D.UseBoundingBox: To know if use the Bounding box for colission checking.
TObject3D.BoundingBox: The bounding box.
TObject3D.RenderBoundingVolume: Render the bounding sphere and/or bounding box.
TWorld3D.CheckCollisions: Check collisions and notify the objects when a collision is detected.

PROCEDURE Render;

Render the object.

Model must be assigned for this method to work.

Note this method will render the object despite the Visible property value.

See also

TObject3D.Visible: Is object visible.
TObject3D.RenderBoundingVolume: Render the bounding sphere and/or bounding box.
TObject3D.Model: Reference to the model.
TEntity3D.Position: Entity position.
TEntity3D.Rotation: Entity rotation.
TObject3D.Scale: Applied scale.

PROCEDURE RenderBoundingVolume;

Render the bounding sphere and/or bounding box.

See also

TObject3D.Radius: Bounding sphere radius.
TObject3D.BoundingBox: The bounding box.
TObject3D.UseBoundingBox: To know if use the Bounding box for colission checking.

Properties

	`property Id: LONGINT READ fId WRITE fId;`
Object identifier.

property Visible: BOOLEAN READ fVisible WRITE fVisible;

Is object visible.

The value is informative. That means method TObject3D.Render will ignore it but TWorld3D.Render will use it to know if it should render it.

Default is True

See also

TObject3D.Render: Render the object.

property Frame: Real read fFrame write fFrame;

Frame to render.

This property is only informative. It can be used by the Model to render different versions of itself.

Default is 0.

property Model: TModel3D READ fModel WRITE fModel;

Reference to the model.

The same model can be used in more than one object. The object doesn't owns the model.

See also

TObject3D.Render: Render the object.
TModel3D.Render: Renders the object.
TObject3D.Frame: Frame to render.

	`property Scaled: Boolean read fDoScale;`
Tell if object is scaled.

property Scale: TVector3D READ fScale write SetScale;

Applied scale.

You can assign a different scale factor for each axis.

See also

TObject3D.Render: Render the object.

property Radius: GLfloat READ fRadius WRITE fRadius;

Bounding sphere radius.

See also

TObject3D.CheckCollision: Check if object collided with another object.
TObject3D.BoundingBox: The bounding box.
TWorld3D.CheckCollisions: Check collisions and notify the objects when a collision is detected.

property UseBoundingBox: BOOLEAN READ fUseBoundingBox WRITE fUseBoundingBox;

To know if use the Bounding box for colission checking.

If True collision routines will use the bounding box values.

if False collision routines will use the Radius only.

See also

TObject3D.CheckCollision: Check if object collided with another object.
TObject3D.BoundingBox: The bounding box.
TWorld3D.CheckCollisions: Check collisions and notify the objects when a collision is detected.

property BoundingBox: TBox read fBoundingBox write SetBoundingBox;

The bounding box.

This box is always paralel to the x, y, z axis and they don't change when object rotates.

The parameters are relative to the object's Position.

If Radius is zero or negative, assigning this property will assign it.

Default is zero.

See also

TObject3D.UseBoundingBox: To know if use the Bounding box for colission checking.
TObject3D.CheckCollision: Check if object collided with another object.
TModel3D.BoundingBox: Returns the bounding box limits.

property NextObject: TObject3D READ fNext WRITE fNext;

Next object in the octree node.

This property is for internal use so you shouldn't mess with it.

property OnCollision: TNotifyObject3DEvent read fOnCollision write fOnCollision;

Event to notify collisions.

The handler receives the reference of the other object implied in the collision or Nil if the collision is with the heightmap.

See also

TWorld3D.CheckCollisions: Check collisions and notify the objects when a collision is detected.

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