Mesh drawer creates a single geom object that can be shaped with different draw commands. More...

#include "meshDrawer.h"

Inheritance diagram for MeshDrawer:

Public Member Functions
	MeshDrawer ()
	Creates the MeshDrawer low level system.
	~MeshDrawer ()
	Destroys the MeshDrawer low level system.
void	begin (NodePath camera, NodePath render)
	Pass the current camera node and the root node.
void	billboard (const LVector3 &pos, const LVector4 &frame, PN_stdfloat size, const LVector4 &color)
	Draws a billboard - particle with no rotation.
void	blended_particle (const LVector3 &pos, const LVector4 &frame1, const LVector4 &frame2, PN_stdfloat blend, PN_stdfloat size, const LVector4 &color, PN_stdfloat rotation)
	Works just like particle but accepts 2 frames and a blend (from 0 to 1) component between them Frame contains u,v,u-size,v-size quadruple.
void	cross_segment (const LVector3 &start, const LVector3 &stop, const LVector4 &frame, PN_stdfloat thickness, const LVector4 &color)
	Draws a segment a line with a thickness.
void	end ()
	Finish the drawing and clearing off the remaining vertexes.
void	explosion (const LVector3 &pos, const LVector4 &frame, PN_stdfloat size, const LVector4 &color, int seed, int number, PN_stdfloat distance)
	Draws number of particles in a sphere like emitter.
virtual TypeHandle	force_init_type ()
void	geometry (NodePath node)
	Draws the geometry that is inside this node path into the MeshDrawer object.
int	get_budget ()
	Gets the total triangle budget of the drawer.
NodePath	get_root ()
	Returns the root NodePath.
virtual TypeHandle	get_type () const
void	link_segment (const LVector3 &pos, const LVector4 &frame, PN_stdfloat thickness, const LVector4 &color)
	Stars or continues linked segment.
void	link_segment_end (const LVector4 &frame, const LVector4 &color)
	Finish drawing linked segments, needs at least two calls to link_segment before it can end the linked segment.
void	particle (const LVector3 &pos, const LVector4 &frame, PN_stdfloat size, const LVector4 &color, PN_stdfloat rotation)
	Draws a particle that is sort of like a bill board but has an extra rotation component.
void	segment (const LVector3 &start, const LVector3 &stop, const LVector4 &frame, PN_stdfloat thickness, const LVector4 &color)
	Draws a segment a line with a thickness.
void	set_budget (int budget)
	Sets the total triangle budget of the drawer.
void	stream (const LVector3 &start, const LVector3 &stop, const LVector4 &frame, PN_stdfloat size, const LVector4 &color, int number, PN_stdfloat offset)
	Draws a number of particles in a big line with a shift dictated by the offset.
void	tri (const LVector3 &v1, const LVector4 &c1, const LVector2 &uv1, const LVector3 &v2, const LVector4 &c2, const LVector2 &uv2, const LVector3 &v3, const LVector4 &c3, const LVector2 &uv3)
	Draws a triangle with the given parameters.
void	uneven_segment (const LVector3 &start, const LVector3 &stop, const LVector4 &frame, PN_stdfloat thickness_start, const LVector4 &color_start, PN_stdfloat thickness_stop, const LVector4 &color_stop)
	Draws a segment a line with different thickness and color on both sides.
Static Public Member Functions
static TypeHandle	get_class_type ()
static void	init_type ()
	This function is declared non-inline to work around a compiler bug in g++ 2.96.

Detailed Description

Mesh drawer creates a single geom object that can be shaped with different draw commands.

This is an efficient way to render bunch of billboards, particles, fast changing triangles. Its implemented by recycling same geom over and over again. Max budget specifies how many triangles are allowed. Some uses of this class can be : particle system, radar icons, health bars, 2d icons, 2d ui, bullets, missile trails. Any that can be drawn with triangles can be drawn with this class. At the low level this uses the GeomVertexRewriter's. The internal geom consists of vertex, normal, uv and color channels.

Definition at line 58 of file meshDrawer.h.

Constructor & Destructor Documentation

MeshDrawer::MeshDrawer ( ) [inline]

Creates the MeshDrawer low level system.

Definition at line 23 of file meshDrawer.I.

MeshDrawer::~MeshDrawer ( ) [inline]

Destroys the MeshDrawer low level system.

Definition at line 40 of file meshDrawer.I.

References NodePath::remove_node().

Member Function Documentation

void MeshDrawer::begin	(	NodePath	camera,
		NodePath	render
	)

Pass the current camera node and the root node.

Passing the camera is required to generate bill boards that face it.

Definition at line 90 of file meshDrawer.cxx.

References NodePath::get_error_type(), NodePath::get_pos(), and NodePath::get_relative_vector().

void MeshDrawer::billboard	(	const LVector3 &	pos,
		const LVector4 &	frame,
		PN_stdfloat	size,
		const LVector4 &	_color
	)

Draws a billboard - particle with no rotation.

Billboards always face the camera. Frame contains u,v,u-size,v-size quadruple.

Definition at line 209 of file meshDrawer.cxx.

References tri().

Referenced by stream().

void MeshDrawer::blended_particle	(	const LVector3 &	pos,
		const LVector4 &	frame1,
		const LVector4 &	frame2,
		PN_stdfloat	blend,
		PN_stdfloat	size,
		const LVector4 &	color,
		PN_stdfloat	rotation
	)

Works just like particle but accepts 2 frames and a blend (from 0 to 1) component between them Frame contains u,v,u-size,v-size quadruple.

Definition at line 190 of file meshDrawer.cxx.

References particle().

void MeshDrawer::cross_segment	(	const LVector3 &	start,
		const LVector3 &	stop,
		const LVector4 &	frame,
		PN_stdfloat	thickness,
		const LVector4 &	color
	)

Draws a segment a line with a thickness.

This segment does not use the bill boarding behavior and instead draws 2 planes in a cross. Stars at start and ends at stop. Frame contains u,v,u-size,v-size quadruple.

Definition at line 255 of file meshDrawer.cxx.

References tri().

void MeshDrawer::end ( )

Finish the drawing and clearing off the remaining vertexes.

Definition at line 132 of file meshDrawer.cxx.

References GeomVertexWriter::add_data3().

void MeshDrawer::explosion	(	const LVector3 &	pos,
		const LVector4 &	frame,
		PN_stdfloat	size,
		const LVector4 &	_color,
		int	seed,
		int	number,
		PN_stdfloat	distance
	)

Draws number of particles in a sphere like emitter.

Frame contains u,v,u-size,v-size quadruple.

Definition at line 340 of file meshDrawer.cxx.

References LVecBase3f::normalize(), and particle().

void MeshDrawer::geometry ( NodePath draw_node )

Draws the geometry that is inside this node path into the MeshDrawer object.

This performs a similar functions as RigidBodyCombiner but for very dynamic situations that share the same texture like physcal chunks of explosions. It can be a little slow

Definition at line 385 of file meshDrawer.cxx.

References NodePath::find_all_matches(), GeomVertexReader::get_data2(), GeomVertexReader::get_data3(), NodePath::get_error_type(), NodePathCollection::get_num_paths(), NodePathCollection::get_path(), NodePath::get_relative_point(), NodePath::node(), GeomVertexReader::set_row_unsafe(), and tri().

int MeshDrawer::get_budget ( ) [inline]

Gets the total triangle budget of the drawer.

Definition at line 80 of file meshDrawer.I.

NodePath MeshDrawer::get_root ( ) [inline]

Returns the root NodePath.

You should use this node to reparent mesh drawer onto the scene might also want to disable depth draw or enable transparency.

Definition at line 57 of file meshDrawer.I.

static void MeshDrawer::init_type ( ) [inline, static]

This function is declared non-inline to work around a compiler bug in g++ 2.96.

Making it inline seems to cause problems in the optimizer.

Reimplemented from TypedObject.

Definition at line 139 of file meshDrawer.h.

References TypedObject::init_type().

void MeshDrawer::link_segment	(	const LVector3 &	pos,
		const LVector4 &	frame,
		PN_stdfloat	thickness,
		const LVector4 &	color
	)

Stars or continues linked segment.

Control position, frame, thickness and color with parameters. Frame contains u,v,u-size,v-size quadruple.

Definition at line 452 of file meshDrawer.cxx.

References NodePath::get_error_type(), NodePath::get_relative_point(), NodePath::node(), and tri().

Referenced by segment().

void MeshDrawer::link_segment_end	(	const LVector4 &	frame,
		const LVector4 &	color
	)

Finish drawing linked segments, needs at least two calls to link_segment before it can end the linked segment.

Frame contains u,v,u-size,v-size quadruple.

Definition at line 554 of file meshDrawer.cxx.

References tri().

Referenced by segment().

void MeshDrawer::particle	(	const LVector3 &	pos,
		const LVector4 &	frame,
		PN_stdfloat	size,
		const LVector4 &	color,
		PN_stdfloat	rotation
	)

Draws a particle that is sort of like a bill board but has an extra rotation component.

Frame contains u,v,u-size,v-size quadruple.

Definition at line 158 of file meshDrawer.cxx.

References tri().

Referenced by blended_particle(), and explosion().

void MeshDrawer::segment	(	const LVector3 &	start,
		const LVector3 &	stop,
		const LVector4 &	frame,
		PN_stdfloat	thickness,
		const LVector4 &	color
	)

Draws a segment a line with a thickness.

That has billboarding effect. Frame contains u,v,u-size,v-size quadruple.

Definition at line 240 of file meshDrawer.cxx.

References link_segment(), and link_segment_end().

void MeshDrawer::set_budget ( int total_budget ) [inline]

Sets the total triangle budget of the drawer.

This will not be exceeded. Don't set some thing too large because it will be slow

Definition at line 69 of file meshDrawer.I.

void MeshDrawer::stream	(	const LVector3 &	start,
		const LVector3 &	stop,
		const LVector4 &	frame,
		PN_stdfloat	size,
		const LVector4 &	_color,
		int	number,
		PN_stdfloat	offset
	)

Draws a number of particles in a big line with a shift dictated by the offset.

Frame contains u,v,u-size,v-size quadruple.

Definition at line 360 of file meshDrawer.cxx.

References billboard(), and LVecBase3f::length().

void MeshDrawer::tri	(	const LVector3 &	v1,
		const LVector4 &	c1,
		const LVector2 &	uv1,
		const LVector3 &	v2,
		const LVector4 &	c2,
		const LVector2 &	uv2,
		const LVector3 &	v3,
		const LVector4 &	c3,
		const LVector2 &	uv3
	)		`[inline]`

Draws a triangle with the given parameters.

Definition at line 89 of file meshDrawer.I.

References GeomVertexWriter::add_data2(), GeomVertexWriter::add_data3(), and GeomVertexWriter::add_data4().

Referenced by billboard(), cross_segment(), geometry(), link_segment(), link_segment_end(), particle(), and uneven_segment().

void MeshDrawer::uneven_segment	(	const LVector3 &	start,
		const LVector3 &	stop,
		const LVector4 &	frame,
		PN_stdfloat	thickness_start,
		const LVector4 &	color_start,
		PN_stdfloat	thickness_stop,
		const LVector4 &	color_stop
	)

Draws a segment a line with different thickness and color on both sides.

Stars at start and ends at stop. Frame contains u,v,u-size,v-size quadruple.

Definition at line 300 of file meshDrawer.cxx.

References tri().

The documentation for this class was generated from the following files:

panda/src/grutil/meshDrawer.h
panda/src/grutil/meshDrawer.cxx
panda/src/grutil/meshDrawer.I

Public Member Functions

Static Public Member Functions

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation