242 lines
9.0 KiB
C++
242 lines
9.0 KiB
C++
// Filename: pointLight.cxx
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// Created by: mike (09Jan97)
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//
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////////////////////////////////////////////////////////////////////
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//
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// PANDA 3D SOFTWARE
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// Copyright (c) 2001 - 2004, Disney Enterprises, Inc. All rights reserved
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//
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// All use of this software is subject to the terms of the Panda 3d
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// Software license. You should have received a copy of this license
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// along with this source code; you will also find a current copy of
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// the license at http://etc.cmu.edu/panda3d/docs/license/ .
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//
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// To contact the maintainers of this program write to
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// panda3d-general@lists.sourceforge.net .
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//
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////////////////////////////////////////////////////////////////////
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#include "pointLight.h"
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#include "graphicsStateGuardianBase.h"
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#include "bamWriter.h"
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#include "bamReader.h"
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#include "datagram.h"
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#include "datagramIterator.h"
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TypeHandle PointLight::_type_handle;
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////////////////////////////////////////////////////////////////////
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// Function: PointLight::CData::make_copy
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// Access: Public, Virtual
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// Description:
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////////////////////////////////////////////////////////////////////
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CycleData *PointLight::CData::
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make_copy() const {
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return new CData(*this);
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}
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////////////////////////////////////////////////////////////////////
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// Function: PointLight::CData::write_datagram
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// Access: Public, Virtual
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// Description: Writes the contents of this object to the datagram
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// for shipping out to a Bam file.
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////////////////////////////////////////////////////////////////////
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void PointLight::CData::
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write_datagram(BamWriter *, Datagram &dg) const {
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_specular_color.write_datagram(dg);
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_attenuation.write_datagram(dg);
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_point.write_datagram(dg);
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}
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////////////////////////////////////////////////////////////////////
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// Function: PointLight::CData::fillin
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// Access: Public, Virtual
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// Description: This internal function is called by make_from_bam to
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// read in all of the relevant data from the BamFile for
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// the new Light.
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////////////////////////////////////////////////////////////////////
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void PointLight::CData::
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fillin(DatagramIterator &scan, BamReader *) {
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_specular_color.read_datagram(scan);
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_attenuation.read_datagram(scan);
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_point.read_datagram(scan);
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}
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////////////////////////////////////////////////////////////////////
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// Function: PointLight::Constructor
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// Access: Published
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// Description:
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////////////////////////////////////////////////////////////////////
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PointLight::
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PointLight(const string &name) :
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LightNode(name)
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{
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}
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////////////////////////////////////////////////////////////////////
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// Function: PointLight::Copy Constructor
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// Access: Protected
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// Description: Do not call the copy constructor directly; instead,
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// use make_copy() or copy_subgraph() to make a copy of
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// a node.
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////////////////////////////////////////////////////////////////////
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PointLight::
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PointLight(const PointLight ©) :
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LightNode(copy),
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_cycler(copy._cycler)
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{
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}
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////////////////////////////////////////////////////////////////////
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// Function: PointLight::make_copy
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// Access: Public, Virtual
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// Description: Returns a newly-allocated PandaNode that is a shallow
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// copy of this one. It will be a different pointer,
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// but its internal data may or may not be shared with
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// that of the original PandaNode. No children will be
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// copied.
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////////////////////////////////////////////////////////////////////
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PandaNode *PointLight::
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make_copy() const {
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return new PointLight(*this);
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}
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////////////////////////////////////////////////////////////////////
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// Function: PointLight::xform
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// Access: Public, Virtual
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// Description: Transforms the contents of this PandaNode by the
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// indicated matrix, if it means anything to do so. For
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// most kinds of PandaNodes, this does nothing.
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////////////////////////////////////////////////////////////////////
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void PointLight::
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xform(const LMatrix4f &mat) {
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LightNode::xform(mat);
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CDWriter cdata(_cycler);
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cdata->_point = cdata->_point * mat;
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mark_viz_stale();
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}
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////////////////////////////////////////////////////////////////////
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// Function: PointLight::write
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// Access: Public, Virtual
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// Description:
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////////////////////////////////////////////////////////////////////
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void PointLight::
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write(ostream &out, int indent_level) const {
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indent(out, indent_level) << *this << ":\n";
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indent(out, indent_level + 2)
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<< "color " << get_color() << "\n";
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indent(out, indent_level + 2)
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<< "specular color " << get_specular_color() << "\n";
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indent(out, indent_level + 2)
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<< "attenuation " << get_attenuation() << "\n";
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}
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////////////////////////////////////////////////////////////////////
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// Function: PointLight::get_vector_to_light
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// Access: Public, Virtual
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// Description: Computes the vector from a particular vertex to this
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// light. The exact vector depends on the type of light
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// (e.g. point lights return a different result than
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// directional lights).
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//
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// The input parameters are the vertex position in
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// question, expressed in object space, and the matrix
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// which converts from light space to object space. The
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// result is expressed in object space.
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//
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// The return value is true if the result is successful,
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// or false if it cannot be computed (e.g. for an
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// ambient light).
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////////////////////////////////////////////////////////////////////
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bool PointLight::
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get_vector_to_light(LVector3f &result, const LPoint3f &from_object_point,
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const LMatrix4f &to_object_space) {
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CDReader cdata(_cycler);
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LPoint3f point = cdata->_point * to_object_space;
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result = point - from_object_point;
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return true;
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}
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////////////////////////////////////////////////////////////////////
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// Function: PointLight::get_class_priority
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// Access: Published, Virtual
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// Description: Returns the relative priority associated with all
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// lights of this class. This priority is used to order
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// lights whose instance priority (get_priority()) is
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// the same--the idea is that other things being equal,
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// AmbientLights (for instance) are less important than
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// DirectionalLights.
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////////////////////////////////////////////////////////////////////
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int PointLight::
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get_class_priority() const {
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return (int)CP_point_priority;
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}
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////////////////////////////////////////////////////////////////////
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// Function: PointLight::bind
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// Access: Public, Virtual
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// Description:
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////////////////////////////////////////////////////////////////////
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void PointLight::
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bind(GraphicsStateGuardianBase *gsg, const NodePath &light, int light_id) {
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gsg->bind_light(this, light, light_id);
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}
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////////////////////////////////////////////////////////////////////
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// Function: PointLight::register_with_read_factory
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// Access: Public, Static
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// Description: Tells the BamReader how to create objects of type
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// PointLight.
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////////////////////////////////////////////////////////////////////
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void PointLight::
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register_with_read_factory() {
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BamReader::get_factory()->register_factory(get_class_type(), make_from_bam);
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}
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////////////////////////////////////////////////////////////////////
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// Function: PointLight::write_datagram
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// Access: Public, Virtual
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// Description: Writes the contents of this object to the datagram
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// for shipping out to a Bam file.
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////////////////////////////////////////////////////////////////////
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void PointLight::
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write_datagram(BamWriter *manager, Datagram &dg) {
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LightNode::write_datagram(manager, dg);
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manager->write_cdata(dg, _cycler);
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}
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////////////////////////////////////////////////////////////////////
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// Function: PointLight::make_from_bam
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// Access: Protected, Static
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// Description: This function is called by the BamReader's factory
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// when a new object of type PointLight is encountered
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// in the Bam file. It should create the PointLight
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// and extract its information from the file.
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////////////////////////////////////////////////////////////////////
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TypedWritable *PointLight::
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make_from_bam(const FactoryParams ¶ms) {
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PointLight *node = new PointLight("");
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DatagramIterator scan;
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BamReader *manager;
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parse_params(params, scan, manager);
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node->fillin(scan, manager);
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return node;
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}
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////////////////////////////////////////////////////////////////////
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// Function: PointLight::fillin
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// Access: Protected
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// Description: This internal function is called by make_from_bam to
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// read in all of the relevant data from the BamFile for
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// the new PointLight.
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////////////////////////////////////////////////////////////////////
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void PointLight::
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fillin(DatagramIterator &scan, BamReader *manager) {
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LightNode::fillin(scan, manager);
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manager->read_cdata(scan, _cycler);
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}
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