irrlicht/source/Irrlicht/CBillboardSceneNode.cpp

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// Copyright (C) 2002-2012 Nikolaus Gebhardt
// This file is part of the "Irrlicht Engine".
// For conditions of distribution and use, see copyright notice in irrlicht.h
#include "CBillboardSceneNode.h"
#include "IVideoDriver.h"
#include "ISceneManager.h"
#include "ICameraSceneNode.h"
#include "os.h"
namespace irr
{
namespace scene
{
//! constructor
CBillboardSceneNode::CBillboardSceneNode(ISceneNode *parent, ISceneManager *mgr, s32 id,
const core::vector3df &position, const core::dimension2d<f32> &size,
video::SColor colorTop, video::SColor colorBottom) :
IBillboardSceneNode(parent, mgr, id, position),
Buffer(new SMeshBuffer())
{
#ifdef _DEBUG
setDebugName("CBillboardSceneNode");
#endif
setSize(size);
Buffer->Vertices.set_used(4);
Buffer->Indices.set_used(6);
Buffer->Indices[0] = 0;
Buffer->Indices[1] = 2;
Buffer->Indices[2] = 1;
Buffer->Indices[3] = 0;
Buffer->Indices[4] = 3;
Buffer->Indices[5] = 2;
Buffer->Vertices[0].TCoords.set(1.0f, 1.0f);
Buffer->Vertices[0].Color = colorBottom;
Buffer->Vertices[1].TCoords.set(1.0f, 0.0f);
Buffer->Vertices[1].Color = colorTop;
Buffer->Vertices[2].TCoords.set(0.0f, 0.0f);
Buffer->Vertices[2].Color = colorTop;
Buffer->Vertices[3].TCoords.set(0.0f, 1.0f);
Buffer->Vertices[3].Color = colorBottom;
}
CBillboardSceneNode::~CBillboardSceneNode()
{
Buffer->drop();
}
//! pre render event
void CBillboardSceneNode::OnRegisterSceneNode()
{
if (IsVisible)
SceneManager->registerNodeForRendering(this);
ISceneNode::OnRegisterSceneNode();
}
//! render
void CBillboardSceneNode::render()
{
video::IVideoDriver *driver = SceneManager->getVideoDriver();
ICameraSceneNode *camera = SceneManager->getActiveCamera();
if (!camera || !driver)
return;
// make billboard look to camera
updateMesh(camera);
driver->setTransform(video::ETS_WORLD, core::IdentityMatrix);
driver->setMaterial(Buffer->Material);
driver->drawMeshBuffer(Buffer);
if (DebugDataVisible & scene::EDS_BBOX) {
driver->setTransform(video::ETS_WORLD, AbsoluteTransformation);
video::SMaterial m;
m.Lighting = false;
driver->setMaterial(m);
driver->draw3DBox(BBoxSafe, video::SColor(0, 208, 195, 152));
}
}
void CBillboardSceneNode::updateMesh(const irr::scene::ICameraSceneNode *camera)
{
// billboard looks toward camera
core::vector3df pos = getAbsolutePosition();
core::vector3df campos = camera->getAbsolutePosition();
core::vector3df target = camera->getTarget();
core::vector3df up = camera->getUpVector();
core::vector3df view = target - campos;
view.normalize();
core::vector3df horizontal = up.crossProduct(view);
if (horizontal.getLength() == 0) {
horizontal.set(up.Y, up.X, up.Z);
}
horizontal.normalize();
core::vector3df topHorizontal = horizontal * 0.5f * TopEdgeWidth;
horizontal *= 0.5f * Size.Width;
// pointing down!
core::vector3df vertical = horizontal.crossProduct(view);
vertical.normalize();
vertical *= 0.5f * Size.Height;
view *= -1.0f;
core::array<video::S3DVertex> &vertices = Buffer->Vertices;
for (s32 i = 0; i < 4; ++i)
vertices[i].Normal = view;
/* Vertices are:
2--1
|\ |
| \|
3--0
*/
vertices[0].Pos = pos + horizontal + vertical;
vertices[1].Pos = pos + topHorizontal - vertical;
vertices[2].Pos = pos - topHorizontal - vertical;
vertices[3].Pos = pos - horizontal + vertical;
Buffer->setDirty(EBT_VERTEX);
Buffer->recalculateBoundingBox();
}
//! returns the axis aligned bounding box of this node
const core::aabbox3d<f32> &CBillboardSceneNode::getBoundingBox() const
{
// Really wrong when scaled (as the node does not scale it's vertices - maybe it should?)
return BBoxSafe;
}
const core::aabbox3d<f32> &CBillboardSceneNode::getTransformedBillboardBoundingBox(const irr::scene::ICameraSceneNode *camera)
{
updateMesh(camera);
return Buffer->BoundingBox;
}
void CBillboardSceneNode::setSize(const core::dimension2d<f32> &size)
{
Size = size;
if (core::equals(Size.Width, 0.0f))
Size.Width = 1.0f;
TopEdgeWidth = Size.Width;
if (core::equals(Size.Height, 0.0f))
Size.Height = 1.0f;
const f32 extent = 0.5f * sqrtf(Size.Width * Size.Width + Size.Height * Size.Height);
BBoxSafe.MinEdge.set(-extent, -extent, -extent);
BBoxSafe.MaxEdge.set(extent, extent, extent);
}
void CBillboardSceneNode::setSize(f32 height, f32 bottomEdgeWidth, f32 topEdgeWidth)
{
Size.set(bottomEdgeWidth, height);
TopEdgeWidth = topEdgeWidth;
if (core::equals(Size.Height, 0.0f))
Size.Height = 1.0f;
if (core::equals(Size.Width, 0.f) && core::equals(TopEdgeWidth, 0.f)) {
Size.Width = 1.0f;
TopEdgeWidth = 1.0f;
}
const f32 extent = 0.5f * sqrtf(Size.Width * Size.Width + Size.Height * Size.Height);
BBoxSafe.MinEdge.set(-extent, -extent, -extent);
BBoxSafe.MaxEdge.set(extent, extent, extent);
}
video::SMaterial &CBillboardSceneNode::getMaterial(u32 i)
{
return Buffer->Material;
}
//! returns amount of materials used by this scene node.
u32 CBillboardSceneNode::getMaterialCount() const
{
return 1;
}
//! gets the size of the billboard
const core::dimension2d<f32> &CBillboardSceneNode::getSize() const
{
return Size;
}
//! Gets the widths of the top and bottom edges of the billboard.
void CBillboardSceneNode::getSize(f32 &height, f32 &bottomEdgeWidth,
f32 &topEdgeWidth) const
{
height = Size.Height;
bottomEdgeWidth = Size.Width;
topEdgeWidth = TopEdgeWidth;
}
//! Set the color of all vertices of the billboard
//! \param overallColor: the color to set
void CBillboardSceneNode::setColor(const video::SColor &overallColor)
{
for (u32 vertex = 0; vertex < 4; ++vertex)
Buffer->Vertices[vertex].Color = overallColor;
}
//! Set the color of the top and bottom vertices of the billboard
//! \param topColor: the color to set the top vertices
//! \param bottomColor: the color to set the bottom vertices
void CBillboardSceneNode::setColor(const video::SColor &topColor,
const video::SColor &bottomColor)
{
Buffer->Vertices[0].Color = bottomColor;
Buffer->Vertices[1].Color = topColor;
Buffer->Vertices[2].Color = topColor;
Buffer->Vertices[3].Color = bottomColor;
}
//! Gets the color of the top and bottom vertices of the billboard
//! \param[out] topColor: stores the color of the top vertices
//! \param[out] bottomColor: stores the color of the bottom vertices
void CBillboardSceneNode::getColor(video::SColor &topColor,
video::SColor &bottomColor) const
{
bottomColor = Buffer->Vertices[0].Color;
topColor = Buffer->Vertices[1].Color;
}
//! Creates a clone of this scene node and its children.
ISceneNode *CBillboardSceneNode::clone(ISceneNode *newParent, ISceneManager *newManager)
{
if (!newParent)
newParent = Parent;
if (!newManager)
newManager = SceneManager;
CBillboardSceneNode *nb = new CBillboardSceneNode(newParent,
newManager, ID, RelativeTranslation, Size);
nb->cloneMembers(this, newManager);
nb->Buffer->Material = Buffer->Material;
nb->Size = Size;
nb->TopEdgeWidth = this->TopEdgeWidth;
video::SColor topColor, bottomColor;
getColor(topColor, bottomColor);
nb->setColor(topColor, bottomColor);
if (newParent)
nb->drop();
return nb;
}
} // end namespace scene
} // end namespace irr