CSampleSceneNode(scene::ISceneNode* parent, scene::ISceneManager* mgr, s32 id)
: scene::ISceneNode(parent, mgr, id)
{
Descriptor = mgr->getVideoDriver()->getVertexDescriptor(0);
VertexBuffer = new scene::CVertexBuffer<video::S3DVertex>();
IndexBuffer = new scene::CIndexBuffer(video::EIT_16BIT);
MeshBuffer = new scene::CMeshBuffer<video::S3DVertex>(Descriptor);
Material.Wireframe = false;
Material.Lighting = false;
video::S3DVertex Vertices[4];
Vertices[0] = video::S3DVertex(0,0,10, 1,1,0, video::SColor(255,0,255,255), 0, 1);
Vertices[1] = video::S3DVertex(10,0,-10, 1,0,0, video::SColor(255,255,0,255), 1, 1);
Vertices[2] = video::S3DVertex(0,20,0, 0,1,1, video::SColor(255,255,255,0), 1, 0);
Vertices[3] = video::S3DVertex(-10,0,-10, 0,0,1, video::SColor(255,0,255,0), 0, 0);
for (s32 i = 0; i<4; ++i)
VertexBuffer->addVertex(&Vertices[i]);
/*
Indices into the 'Vertices' array. A triangle needs 3 vertices
so you have to pass the 3 corresponding indices for each triangle to
tell which of the vertices should be used for it.
*/
IndexBuffer->addIndex(0);
IndexBuffer->addIndex(2);
IndexBuffer->addIndex(3);
IndexBuffer->addIndex(2);
IndexBuffer->addIndex(1);
IndexBuffer->addIndex(3);
IndexBuffer->addIndex(1);
IndexBuffer->addIndex(0);
IndexBuffer->addIndex(3);
IndexBuffer->addIndex(2);
IndexBuffer->addIndex(0);
IndexBuffer->addIndex(1);
/*
Append Vertex and Index buffers to the Mesh buffer.
*/
MeshBuffer->setVertexBuffer(VertexBuffer, 0);
MeshBuffer->setIndexBuffer(IndexBuffer);
/*
The Irrlicht Engine needs to know the bounding box of a scene node.
It will use it for automatic culling and other things. Hence, we
need to create a bounding box from the 4 vertices we use.
If you do not want the engine to use the box for automatic culling,
and/or don't want to create the box, you could also call
irr::scene::ISceneNode::setAutomaticCulling() with irr::scene::EAC_OFF.
*/
Box.reset(Vertices[0].Pos);
for (s32 i=1; i<4; ++i)
Box.addInternalPoint(Vertices[i].Pos);
}
CSampleSceneNode(scene::ISceneNode* parent, scene::ISceneManager* mgr, s32 id)
: scene::ISceneNode(parent, mgr, id)
{
Material.Wireframe = false;
Material.Lighting = false;
Vertices[0] = video::S3DVertex(0,0,10, 1,1,0,
video::SColor(255,0,255,255), 0, 1);
Vertices[1] = video::S3DVertex(10,0,-10, 1,0,0,
video::SColor(255,255,0,255), 1, 1);
Vertices[2] = video::S3DVertex(0,20,0, 0,1,1,
video::SColor(255,255,255,0), 1, 0);
Vertices[3] = video::S3DVertex(-10,0,-10, 0,0,1,
video::SColor(255,0,255,0), 0, 0);
/*
The Irrlicht Engine needs to know the bounding box of a scene node.
It will use it for automatic culling and other things. Hence, we
need to create a bounding box from the 4 vertices we use.
If you do not want the engine to use the box for automatic culling,
and/or don't want to create the box, you could also call
irr::scene::ISceneNode::setAutomaticCulling() with irr::scene::EAC_OFF.
*/
Box.reset(Vertices[0].Pos);
for (s32 i=1; i<4; ++i)
Box.addInternalPoint(Vertices[i].Pos);
}
CSampleSceneNode(scene::ISceneNode* parent, scene::ISceneManager *mgr, s32 id)
:scene::ISceneNode(parent, mgr, id)
{
Material.Wireframe = false;
Material.Lighting = false;
Vertices[0] = video::S3DVertex(0,0,10, 1,1,0, video::SColor(255,0,255,255), 0, 1);
Vertices[1] = video::S3DVertex(10,0,-10, 1,0,0, video::SColor(255,255,0,255), 1, 1);
Vertices[2] = video::S3DVertex(0,20,0, 0,1,1, video::SColor(255,255,255,0), 1, 0);
Vertices[3] = video::S3DVertex(-10,0,-10, 0,0,1, video::SColor(255,0, 255, 0), 0, 0);
Box.reset(Vertices[0].Pos);
for (s32 i=1; i<4; ++i)
{
Box.addInternalPoint(Vertices[i].Pos);
}
}
void BuildCylinder(
core::array<video::S3DVertex>& vertexArray,
core::array<u16>& indexArray,
core::aabbox3d<f32>& boundingBox,
f32 height,
f32 startRadius,
f32 endRadius,
s32 radialSegments,
const core::matrix4& transform,
f32 startTCoordY = 0.0f,
f32 endTCoordY = 1.0f,
video::SColor startColor = video::SColor(255,255,255,255),
video::SColor endColor = video::SColor(255,255,255,255) )
{
u16 vertexIndex = vertexArray.size();
s32 radialVertices = radialSegments + 1; // We want one additional vertex to make the texture wraps correctly
// Place bottom cap
for ( s32 i=0; i<radialVertices; i++ )
{
f32 angle = 2.0f * core::PI * i / (f32)( radialSegments );
core::vector3df dir;
dir.X = cos(angle);
dir.Z = sin(angle);
core::vector3df pos;
core::vector3df normal = dir;
pos = dir * startRadius;
// Place bottom vertex
transform.transformVect( pos );
transform.rotateVect( normal );
core::vector2df tcoord;
tcoord.X = (f32)( i ) / (f32)( radialSegments );
tcoord.Y = startTCoordY;
vertexArray.push_back( video::S3DVertex(
pos,
normal,
startColor,
tcoord ) );
boundingBox.addInternalPoint( pos );
}
// Place top cap and indices
for ( s32 i=0; i<radialVertices; i++ )
{
f32 angle = 2.0f * core::PI * i / (f32)( radialSegments );
core::vector3df dir;
dir.X = cos(angle);
dir.Z = sin(angle);
core::vector3df normal = dir;
core::vector3df pos = dir * endRadius;
pos.Y = height;
transform.transformVect( pos );
transform.rotateVect( normal );
core::vector2df tcoord;
tcoord.X = (f32)( i ) / (f32)( radialSegments );
tcoord.Y = endTCoordY;
vertexArray.push_back( video::S3DVertex(
pos,
normal,
endColor,
tcoord ) );
boundingBox.addInternalPoint(pos);
// Add indices
if ( i != radialVertices-1 )
{
s32 i2 = (i+1)%radialVertices;
// Place the indices
indexArray.push_back ( vertexIndex + i );
indexArray.push_back ( vertexIndex + radialVertices + i );
indexArray.push_back ( vertexIndex + i2 );
indexArray.push_back ( vertexIndex + radialVertices + i );
indexArray.push_back ( vertexIndex + radialVertices + i2 );
indexArray.push_back ( vertexIndex + i2 );
}
}
}
CSampleSceneNode(scene::ISceneNode* parent, scene::ISceneManager* mgr, s32 id
,core::vector3d<float>P[]
,core::vector3d<float>Ups[]
,short ncontrolpts)
: scene::ISceneNode(parent, mgr, id)
{
Material.Wireframe = true;
Material.Lighting = false;
std::vector<core::vector3d<float> >p;
core::vector3d<float> basetri[3]
= {{-0.5,0,0},{0.5,0,0},{0.25,-0.25,0}};
core::vector3d<float> rottri[2];
core::vector3d<float> A,B,C;
float ABdot,BCdot,ABmag,BCmag;
float cosABang,cosBCang,ABang,BCang,angtotal;
//calculate angle of rotation
{
A=P[1]-P[0];
B=P[2]-P[1];
C=P[3]-P[2];
ABdot=A.dotProduct(B);
BCdot=B.dotProduct(C);
ABmag=A.getLength()*B.getLength();
BCmag=B.getLength()*C.getLength();
cosABang=ABdot/ABmag;
cosBCang=BCdot/BCmag;
ABang=acos(cosABang);
BCang=acos(cosBCang);
angtotal=ABang+BCang;
}
//set up the interpolation of the spline
const float pi=3.1415927;
float angdegrees=angtotal*180/pi;
float npoints=angdegrees/12;
nverts=(s16)(npoints+0.5);
float tstep=1/std::max((float)nverts,1.0f);
core::vector3d<float> curpt;
core::vector3d<float> curup;
//print some info before setting the interppolation points
std::cout<<"total curve angle: "<<angtotal<<std::endl;
std::cout<<"; steps: "<<nverts<<std::endl;
//interpolate the spline
p.clear();
for(float t=0.0;t<1.0+tstep;t+=tstep)
{
float scale[4]=
{
pow(1.0f-t,3)
,3*pow(1.0f-t,2)*t
,3*(1.0f-t)*pow(t,2)
,pow(t,3)
};
curup= scale[0]*Ups[0] //pow(1-t,3)*P[0]
+ scale[1]*Ups[1] //3*pow(1-t,2)*t*P[1]
+ scale[2]*Ups[2] //3*(1-t)*pow(t,2)*P[2]
+ scale[3]*Ups[3]; //pow(t,3)*P[3]
curpt= scale[0]*P[0] //pow(1-t,3)*P[0]
+ scale[1]*P[1] //3*pow(1-t,2)*t*P[1]
+ scale[2]*P[2] //3*(1-t)*pow(t,2)*P[2]
+ scale[3]*P[3]; //pow(t,3)*P[3]
//=(1-$A11)^3*B$4 + 3*(1-$A11)^2*$A11*B$5
//+ 3*(1-$A11)*$A11^2*B$6 + $A11^3*B$7
p.push_back(curpt);
}
for(int i=0;i<p.size();i++)
{
std::cout<<"interpolation - pt "<<i<<" - ";
std::cout<<"("<<p[i].X<<","<<p[i].Y<<","<<p[i].Z<<")"<<std::endl;
Vertices[i] =
video::S3DVertex(p[i].X,p[i].Y,p[i].Z, 1,1,0,
video::SColor(255,0,0,255), 0, 1);
}
/*
The Irrlicht Engine needs to know the bounding box of a scene node.
It will use it for automatic culling and other things. Hence, we
need to create a bounding box from the 4 vertices we use.
If you do not want the engine to use the box for automatic culling,
and/or don't want to create the box, you could also call
irr::scene::ISceneNode::setAutomaticCulling() with irr::scene::EAC_OFF.
*/
Box.reset(Vertices[0].Pos);
for (s32 i=1; i<nverts; ++i)
Box.addInternalPoint(Vertices[i].Pos);
}
