Piece of 3D geometry that tracks its own 2D projection. More...

Public Member Functions
	UIGeom ()

void	computeProjection (RenderDevice *rd)
	Computes the 2D positions from the 3D ones using the renderDevice and updates the zOrder. More...

bool	contains (const Vector2 &p, float &nearestDepth, Vector2 &tangent2D, float &projectionW, float lineRadius=9) const
	Returns true and sets nearestDepth (on the range 0 = close, 1 = far) if p is in a polygon (or within lineRadius of the nearest line) and the depth of that object is less than nearestDepth, otherwise returns false. More...

void	render (RenderDevice *rd, const Color3 &color, float lineScale=1.0f) const
	Render in 3D using the current blending mode, etc. More...

Public Attributes
Array< PolyLine2D >	line2D
	Recomputed from 3D in the computeProjection method. More...

Array< PolyLine >	line3D
	Relative to the "current" object to world matrix. More...

Array< Array< float > >	lineDepth

Array< Array< float > >	lineW

Array< ConvexPolygon2D >	poly2D
	Recomputed from 3D in the computeProjection method. More...

Array< ConvexPolygon >	poly3D
	Relative to the "current" object to world matrix. More...

Array< bool >	polyBackfacing
	If last time we rendered the poly3D was backwards. More...

Array< float >	polyDepth

bool	visible

Static Protected Member Functions
static Vector3	computeEye (RenderDevice *rd)
	Returns the object space eye point. More...

static Vector3	segmentNormal (const LineSegment &seg, const Vector3 &eye)
	Returns the normal to a line segment. More...

Protected Attributes
bool	m_twoSidedPolys
	If true, backface polygons are tested for mouse clicks. More...

Detailed Description

Piece of 3D geometry that tracks its own 2D projection.

For use in building 3D clickable widgets using only 2D code.

The 2D approach allows the click width around a line to be constant width; it also allows the use of arbitrary projection matrices. However, it has problems at the near plane unlike a ray-cast 3D approach.

Constructor & Destructor Documentation

◆ UIGeom()

G3D::_internal::UIGeom::UIGeom ( )

inline

Member Function Documentation

◆ computeEye()

static Vector3 G3D::_internal::UIGeom::computeEye ( RenderDevice * rd )

staticprotected

Returns the object space eye point.

◆ computeProjection()

void G3D::_internal::UIGeom::computeProjection ( RenderDevice * rd )

Computes the 2D positions from the 3D ones using the renderDevice and updates the zOrder.

◆ contains()

bool G3D::_internal::UIGeom::contains	(	const Vector2 &	p,
		float &	nearestDepth,
		Vector2 &	tangent2D,
		float &	projectionW,
		float	lineRadius = `9`
	)		const

Returns true and sets nearestDepth (on the range 0 = close, 1 = far) if p is in a polygon (or within lineRadius of the nearest line) and the depth of that object is less than nearestDepth, otherwise returns false.

depth values are approximate.

Parameters

tangent2D	Returns the projected tangent (unit length 3D vector projected into 2D, which then has non-unit length) to the selected location if it was a line; undefined if it was a plane.
projectionW	Returns the if close to a line.

◆ render()

void G3D::_internal::UIGeom::render	(	RenderDevice *	rd,
		const Color3 &	color,
		float	lineScale = `1.0f`
	)		const

Render in 3D using the current blending mode, etc.

Line normals are set to face towards the camera, perpendicular to the line.

◆ segmentNormal()

static Vector3 G3D::_internal::UIGeom::segmentNormal	(	const LineSegment &	seg,
		const Vector3 &	eye
	)

staticprotected

Returns the normal to a line segment.

Member Data Documentation

◆ line2D

Array<PolyLine2D> G3D::_internal::UIGeom::line2D

Recomputed from 3D in the computeProjection method.

◆ line3D

Array<PolyLine> G3D::_internal::UIGeom::line3D

Relative to the "current" object to world matrix.

◆ lineDepth

Array< Array<float> > G3D::_internal::UIGeom::lineDepth

◆ lineW

Array< Array<float> > G3D::_internal::UIGeom::lineW

◆ m_twoSidedPolys

bool G3D::_internal::UIGeom::m_twoSidedPolys

protected

If true, backface polygons are tested for mouse clicks.

◆ poly2D

Array<ConvexPolygon2D> G3D::_internal::UIGeom::poly2D

Recomputed from 3D in the computeProjection method.

◆ poly3D

Array<ConvexPolygon> G3D::_internal::UIGeom::poly3D

Relative to the "current" object to world matrix.

◆ polyBackfacing

Array<bool> G3D::_internal::UIGeom::polyBackfacing

If last time we rendered the poly3D was backwards.

◆ polyDepth

Array< float > G3D::_internal::UIGeom::polyDepth

◆ visible

bool G3D::_internal::UIGeom::visible

Public Member Functions

Public Attributes

Static Protected Member Functions

Protected Attributes