irrlicht/source/Irrlicht/CGeometryCreator.cpp

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// Copyright (C) 2002-2009 Nikolaus Gebhardt
// This file is part of the "Irrlicht Engine".
// For conditions of distribution and use, see copyright notice in irrlicht.h
#include "CGeometryCreator.h"
#include "SAnimatedMesh.h"
#include "SMeshBuffer.h"
#include "SMesh.h"
#include "IMesh.h"
#include "IVideoDriver.h"
#include "CImage.h"
#include "os.h"
namespace irr
{
namespace scene
{
// creates a hill plane
IMesh* CGeometryCreator::createHillPlaneMesh(
const core::dimension2d<f32>& tileSize,
const core::dimension2d<u32>& tc, video::SMaterial* material,
f32 hillHeight, const core::dimension2d<f32>& ch,
const core::dimension2d<f32>& textureRepeatCount)
{
core::dimension2d<u32> tileCount = tc;
core::dimension2d<f32> countHills = ch;
if (countHills.Width < 0.01f)
countHills.Width = 1.f;
if (countHills.Height < 0.01f)
countHills.Height = 1.f;
// center
const core::position2d<f32> center((tileSize.Width * tileCount.Width) * 0.5f, (tileSize.Height * tileCount.Height) * 0.5f);
// texture coord step
const core::dimension2d<f32> tx(
textureRepeatCount.Width / tileCount.Width,
textureRepeatCount.Height / tileCount.Height);
// add one more point in each direction for proper tile count
++tileCount.Height;
++tileCount.Width;
SMeshBuffer* buffer = new SMeshBuffer();
video::S3DVertex vtx;
vtx.Color.set(255,255,255,255);
// create vertices from left-front to right-back
u32 x;
f32 sx=0.f, tsx=0.f;
for (x=0; x<tileCount.Width; ++x)
{
f32 sy=0.f, tsy=0.f;
for (u32 y=0; y<tileCount.Height; ++y)
{
vtx.Pos.set(sx - center.X, 0, sy - center.Y);
vtx.TCoords.set(tsx, 1.0f - tsy);
if (hillHeight != 0.0f)
vtx.Pos.Y = sinf(vtx.Pos.X * countHills.Width * core::PI / center.X) *
cosf(vtx.Pos.Z * countHills.Height * core::PI / center.Y) *
hillHeight;
buffer->Vertices.push_back(vtx);
sy += tileSize.Height;
tsy += tx.Height;
}
sx += tileSize.Width;
tsx += tx.Width;
}
// create indices
for (x=0; x<tileCount.Width-1; ++x)
{
for (u32 y=0; y<tileCount.Height-1; ++y)
{
const s32 current = x*tileCount.Height + y;
buffer->Indices.push_back(current);
buffer->Indices.push_back(current + 1);
buffer->Indices.push_back(current + tileCount.Height);
buffer->Indices.push_back(current + 1);
buffer->Indices.push_back(current + 1 + tileCount.Height);
buffer->Indices.push_back(current + tileCount.Height);
}
}
// recalculate normals
for (u32 i=0; i<buffer->Indices.size(); i+=3)
{
const core::vector3df normal = core::plane3d<f32>(
buffer->Vertices[buffer->Indices[i+0]].Pos,
buffer->Vertices[buffer->Indices[i+1]].Pos,
buffer->Vertices[buffer->Indices[i+2]].Pos).Normal;
buffer->Vertices[buffer->Indices[i+0]].Normal = normal;
buffer->Vertices[buffer->Indices[i+1]].Normal = normal;
buffer->Vertices[buffer->Indices[i+2]].Normal = normal;
}
if (material)
buffer->Material = *material;
buffer->recalculateBoundingBox();
SMesh* mesh = new SMesh();
mesh->addMeshBuffer(buffer);
mesh->recalculateBoundingBox();
buffer->drop();
return mesh;
}
IMesh* CGeometryCreator::createTerrainMesh(video::IImage* texture,
video::IImage* heightmap, const core::dimension2d<f32>& stretchSize,
f32 maxHeight, video::IVideoDriver* driver,
const core::dimension2d<u32>& maxVtxBlockSize,
bool debugBorders)
{
if (!texture || !heightmap)
return 0;
// debug border
const s32 borderSkip = debugBorders ? 0 : 1;
video::S3DVertex vtx;
vtx.Color.set(255,255,255,255);
SMesh* mesh = new SMesh();
const u32 tm = os::Timer::getRealTime()/1000;
const core::dimension2d<u32> hMapSize= heightmap->getDimension();
const core::dimension2d<u32> tMapSize= texture->getDimension();
const core::position2d<f32> thRel(static_cast<f32>(tMapSize.Width) / hMapSize.Width, static_cast<f32>(tMapSize.Height) / hMapSize.Height);
maxHeight /= 255.0f; // height step per color value
core::position2d<u32> processed(0,0);
while (processed.Y<hMapSize.Height)
{
while(processed.X<hMapSize.Width)
{
core::dimension2d<u32> blockSize = maxVtxBlockSize;
if (processed.X + blockSize.Width > hMapSize.Width)
blockSize.Width = hMapSize.Width - processed.X;
if (processed.Y + blockSize.Height > hMapSize.Height)
blockSize.Height = hMapSize.Height - processed.Y;
SMeshBuffer* buffer = new SMeshBuffer();
buffer->setHardwareMappingHint(scene::EHM_STATIC);
buffer->Vertices.reallocate(blockSize.getArea());
// add vertices of vertex block
u32 y;
core::vector2df pos(0.f, processed.Y*stretchSize.Height);
const core::vector2df bs(1.f/blockSize.Width, 1.f/blockSize.Height);
core::vector2df tc(0.f, 0.5f*bs.Y);
for (y=0; y<blockSize.Height; ++y)
{
pos.X=processed.X*stretchSize.Width;
tc.X=0.5f*bs.X;
for (u32 x=0; x<blockSize.Width; ++x)
{
const f32 height = heightmap->getPixel(x+processed.X, y+processed.Y).getAverage() * maxHeight;
vtx.Pos.set(pos.X, height, pos.Y);
vtx.TCoords.set(tc);
buffer->Vertices.push_back(vtx);
pos.X += stretchSize.Width;
tc.X += bs.X;
}
pos.Y += stretchSize.Height;
tc.Y += bs.Y;
}
buffer->Indices.reallocate((blockSize.Height-1)*(blockSize.Width-1)*6);
// add indices of vertex block
s32 c1 = 0;
for (y=0; y<blockSize.Height-1; ++y)
{
for (u32 x=0; x<blockSize.Width-1; ++x)
{
const s32 c = c1 + x;
buffer->Indices.push_back(c);
buffer->Indices.push_back(c + blockSize.Width);
buffer->Indices.push_back(c + 1);
buffer->Indices.push_back(c + 1);
buffer->Indices.push_back(c + blockSize.Width);
buffer->Indices.push_back(c + 1 + blockSize.Width);
}
c1 += blockSize.Width;
}
// recalculate normals
for (u32 i=0; i<buffer->Indices.size(); i+=3)
{
const core::vector3df normal = core::plane3d<f32>(
buffer->Vertices[buffer->Indices[i+0]].Pos,
buffer->Vertices[buffer->Indices[i+1]].Pos,
buffer->Vertices[buffer->Indices[i+2]].Pos).Normal;
buffer->Vertices[buffer->Indices[i+0]].Normal = normal;
buffer->Vertices[buffer->Indices[i+1]].Normal = normal;
buffer->Vertices[buffer->Indices[i+2]].Normal = normal;
}
if (buffer->Vertices.size())
{
c8 textureName[64];
// create texture for this block
video::IImage* img = new video::CImage(texture,
core::position2d<s32>(core::floor32(processed.X*thRel.X), core::floor32(processed.Y*thRel.Y)),
core::dimension2d<u32>(core::floor32(blockSize.Width*thRel.X), core::floor32(blockSize.Height*thRel.Y)));
sprintf(textureName, "terrain%u_%u", tm, mesh->getMeshBufferCount());
buffer->Material.setTexture(0, driver->addTexture(textureName, img));
if (buffer->Material.getTexture(0))
{
c8 tmp[255];
sprintf(tmp, "Generated terrain texture (%dx%d): %s",
buffer->Material.getTexture(0)->getSize().Width,
buffer->Material.getTexture(0)->getSize().Height,
textureName);
os::Printer::log(tmp);
}
else
os::Printer::log("Could not create terrain texture.", textureName, ELL_ERROR);
img->drop();
}
buffer->recalculateBoundingBox();
mesh->addMeshBuffer(buffer);
buffer->drop();
// keep on processing
processed.X += maxVtxBlockSize.Width - borderSkip;
}
// keep on processing
processed.X = 0;
processed.Y += maxVtxBlockSize.Height - borderSkip;
}
mesh->recalculateBoundingBox();
return mesh;
}
/*
a cylinder, a cone and a cross
point up on (0,1.f, 0.f )
*/
IMesh* CGeometryCreator::createArrowMesh(const u32 tesselationCylinder,
const u32 tesselationCone,
const f32 height,
const f32 cylinderHeight,
const f32 width0,
const f32 width1,
const video::SColor vtxColor0,
const video::SColor vtxColor1)
{
SMesh* mesh = (SMesh*)createCylinderMesh(width0, cylinderHeight, tesselationCylinder, vtxColor0, false);
IMesh* mesh2 = createConeMesh(width1, height-cylinderHeight, tesselationCone, vtxColor1, vtxColor0);
for (u32 i=0; i<mesh2->getMeshBufferCount(); ++i)
{
scene::IMeshBuffer* buffer = mesh2->getMeshBuffer(i);
for (u32 j=0; j<buffer->getVertexCount(); ++j)
buffer->getPosition(j).Y += cylinderHeight;
mesh->addMeshBuffer(buffer);
}
mesh2->drop();
return mesh;
}
/* A sphere with proper normals and texture coords */
IMesh* CGeometryCreator::createSphereMesh(f32 radius, u32 polyCountX, u32 polyCountY)
{
SMeshBuffer* buffer = new SMeshBuffer();
// thanks to Alfaz93 who made his code available for Irrlicht on which
// this one is based!
// we are creating the sphere mesh here.
if (polyCountX < 2)
polyCountX = 2;
if (polyCountY < 2)
polyCountY = 2;
if (polyCountX * polyCountY > 32767) // prevent u16 overflow
{
if (polyCountX > polyCountY) // prevent u16 overflow
polyCountX = 32767/polyCountY-1;
else
polyCountY = 32767/(polyCountX+1);
}
u32 polyCountXPitch = polyCountX+1; // get to same vertex on next level
buffer->Vertices.set_used((polyCountXPitch * polyCountY) + 2);
buffer->Indices.set_used((polyCountX * polyCountY) * 6);
const video::SColor clr(100, 255,255,255);
u32 i=0;
u32 level = 0;
for (u32 p1 = 0; p1 < polyCountY-1; ++p1)
{
//main quads, top to bottom
for (u32 p2 = 0; p2 < polyCountX - 1; ++p2)
{
const u32 curr = level + p2;
buffer->Indices[i] = curr + polyCountXPitch;
buffer->Indices[++i] = curr;
buffer->Indices[++i] = curr + 1;
buffer->Indices[++i] = curr + polyCountXPitch;
buffer->Indices[++i] = curr+1;
buffer->Indices[++i] = curr + 1 + polyCountXPitch;
++i;
}
// the connectors from front to end
buffer->Indices[i] = level + polyCountX - 1 + polyCountXPitch;
buffer->Indices[++i] = level + polyCountX - 1;
buffer->Indices[++i] = level + polyCountX;
++i;
buffer->Indices[i] = level + polyCountX - 1 + polyCountXPitch;
buffer->Indices[++i] = level + polyCountX;
buffer->Indices[++i] = level + polyCountX + polyCountXPitch;
++i;
level += polyCountXPitch;
}
const u32 polyCountSq = polyCountXPitch * polyCountY; // top point
const u32 polyCountSq1 = polyCountSq + 1; // bottom point
const u32 polyCountSqM1 = (polyCountY - 1) * polyCountXPitch; // last row's first vertex
for (u32 p2 = 0; p2 < polyCountX - 1; ++p2)
{
// create triangles which are at the top of the sphere
buffer->Indices[i] = polyCountSq;
buffer->Indices[++i] = p2 + 1;
buffer->Indices[++i] = p2;
++i;
// create triangles which are at the bottom of the sphere
buffer->Indices[i] = polyCountSqM1 + p2;
buffer->Indices[++i] = polyCountSqM1 + p2 + 1;
buffer->Indices[++i] = polyCountSq1;
++i;
}
// create final triangle which is at the top of the sphere
buffer->Indices[i] = polyCountSq;
buffer->Indices[++i] = polyCountX;
buffer->Indices[++i] = polyCountX-1;
++i;
// create final triangle which is at the bottom of the sphere
buffer->Indices[i] = polyCountSqM1 + polyCountX - 1;
buffer->Indices[++i] = polyCountSqM1;
buffer->Indices[++i] = polyCountSq1;
// calculate the angle which separates all points in a circle
const f64 AngleX = 2 * core::PI / polyCountX;
const f64 AngleY = core::PI / polyCountY;
i = 0;
f64 axz;
// we don't start at 0.
f64 ay = 0;//AngleY / 2;
for (u32 y = 0; y < polyCountY; ++y)
{
ay += AngleY;
const f64 sinay = sin(ay);
axz = 0;
// calculate the necessary vertices without the doubled one
for (u32 xz = 0;xz < polyCountX; ++xz)
{
// calculate points position
const core::vector3df pos(static_cast<f32>(radius * cos(axz) * sinay),
static_cast<f32>(radius * cos(ay)),
static_cast<f32>(radius * sin(axz) * sinay));
// for spheres the normal is the position
core::vector3df normal(pos);
normal.normalize();
// calculate texture coordinates via sphere mapping
// tu is the same on each level, so only calculate once
f32 tu = 0.5f;
if (y==0)
{
if (normal.Y != -1.0f && normal.Y != 1.0f)
tu = static_cast<f32>(acos(core::clamp(normal.X/sinay, -1.0, 1.0)) * 0.5 *core::RECIPROCAL_PI64);
if (normal.Z < 0.0f)
tu=1-tu;
}
else
tu = buffer->Vertices[i-polyCountXPitch].TCoords.X;
buffer->Vertices[i] = video::S3DVertex(pos.X, pos.Y, pos.Z,
normal.X, normal.Y, normal.Z,
clr, tu,
static_cast<f32>(ay*core::RECIPROCAL_PI64));
++i;
axz += AngleX;
}
// This is the doubled vertex on the initial position
buffer->Vertices[i] = video::S3DVertex(buffer->Vertices[i-polyCountX]);
buffer->Vertices[i].TCoords.X=1.0f;
++i;
}
// the vertex at the top of the sphere
buffer->Vertices[i] = video::S3DVertex(0.0f,radius,0.0f, 0.0f,1.0f,0.0f, clr, 0.5f, 0.0f);
// the vertex at the bottom of the sphere
++i;
buffer->Vertices[i] = video::S3DVertex(0.0f,-radius,0.0f, 0.0f,-1.0f,0.0f, clr, 0.5f, 1.0f);
// recalculate bounding box
buffer->BoundingBox.reset(buffer->Vertices[i].Pos);
buffer->BoundingBox.addInternalPoint(buffer->Vertices[i-1].Pos);
buffer->BoundingBox.addInternalPoint(radius,0.0f,0.0f);
buffer->BoundingBox.addInternalPoint(-radius,0.0f,0.0f);
buffer->BoundingBox.addInternalPoint(0.0f,0.0f,radius);
buffer->BoundingBox.addInternalPoint(0.0f,0.0f,-radius);
SMesh* mesh = new SMesh();
mesh->addMeshBuffer(buffer);
buffer->drop();
mesh->recalculateBoundingBox();
return mesh;
}
/* A cylinder with proper normals and texture coords */
IMesh* CGeometryCreator::createCylinderMesh(f32 radius, f32 length, u32 tesselation, const video::SColor& color, bool closeTop, f32 oblique)
{
SMeshBuffer* buffer = new SMeshBuffer();
const f32 recTesselation = core::reciprocal((f32)tesselation);
const f32 recTesselationHalf = recTesselation * 0.5f;
const f32 angleStep = (core::PI * 2.f ) * recTesselation;
const f32 angleStepHalf = angleStep*0.5f;
u32 i;
video::S3DVertex v;
v.Color = color;
buffer->Vertices.reallocate(tesselation*4+(closeTop?2:1));
buffer->Indices.reallocate((tesselation*2)*(closeTop?12:9));
f32 tcx = 0.f;
for ( i = 0; i != tesselation; ++i )
{
const f32 angle = angleStep * i;
v.Pos.X = radius * cosf(angle);
v.Pos.Y = 0.f;
v.Pos.Z = radius * sinf(angle);
v.Normal = v.Pos;
v.Normal.normalize();
v.TCoords.X=tcx;
v.TCoords.Y=0.f;
buffer->Vertices.push_back(v);
v.Pos.X += oblique;
v.Pos.Y = length;
v.Normal = v.Pos;
v.Normal.normalize();
v.TCoords.Y=1.f;
buffer->Vertices.push_back(v);
v.Pos.X = radius * cosf(angle + angleStepHalf);
v.Pos.Y = 0.f;
v.Pos.Z = radius * sinf(angle + angleStepHalf);
v.Normal = v.Pos;
v.Normal.normalize();
v.TCoords.X=tcx+recTesselationHalf;
v.TCoords.Y=0.f;
buffer->Vertices.push_back(v);
v.Pos.X += oblique;
v.Pos.Y = length;
v.Normal = v.Pos;
v.Normal.normalize();
v.TCoords.Y=1.f;
buffer->Vertices.push_back(v);
tcx += recTesselation;
}
const u32 nonWrappedSize = ( tesselation* 4 ) - 2;
for ( i = 0; i != nonWrappedSize; i += 2 )
{
buffer->Indices.push_back ( i + 2 );
buffer->Indices.push_back ( i + 0 );
buffer->Indices.push_back ( i + 1 );
buffer->Indices.push_back ( i + 2 );
buffer->Indices.push_back ( i + 1 );
buffer->Indices.push_back ( i + 3 );
}
buffer->Indices.push_back ( 0 );
buffer->Indices.push_back ( i + 0 );
buffer->Indices.push_back ( i + 1 );
buffer->Indices.push_back ( 0 );
buffer->Indices.push_back ( i + 1 );
buffer->Indices.push_back ( 1 );
// close down
v.Pos.X = 0.f;
v.Pos.Y = 0.f;
v.Pos.Z = 0.f;
v.Normal.X = 0.f;
v.Normal.Y = -1.f;
v.Normal.Z = 0.f;
v.TCoords.X = 1.f;
v.TCoords.Y = 1.f;
buffer->Vertices.push_back ( v );
u32 index = buffer->Vertices.size () - 1;
for ( i = 0; i != nonWrappedSize; i += 2 )
{
buffer->Indices.push_back ( index );
buffer->Indices.push_back ( i + 0 );
buffer->Indices.push_back ( i + 2 );
}
buffer->Indices.push_back ( index );
buffer->Indices.push_back ( i + 0 );
buffer->Indices.push_back ( 0 );
if (closeTop)
{
// close top
v.Pos.X = oblique;
v.Pos.Y = length;
v.Pos.Z = 0.f;
v.Normal.X = 0.f;
v.Normal.Y = 1.f;
v.Normal.Z = 0.f;
v.TCoords.X = 0.f;
v.TCoords.Y = 0.f;
buffer->Vertices.push_back ( v );
index = buffer->Vertices.size () - 1;
for ( i = 0; i != nonWrappedSize; i += 2 )
{
buffer->Indices.push_back ( i + 1 );
buffer->Indices.push_back ( index );
buffer->Indices.push_back ( i + 3 );
}
buffer->Indices.push_back ( i + 1 );
buffer->Indices.push_back ( index );
buffer->Indices.push_back ( 1 );
}
buffer->recalculateBoundingBox();
SMesh* mesh = new SMesh();
mesh->addMeshBuffer(buffer);
mesh->recalculateBoundingBox();
buffer->drop();
return mesh;
}
/* A cone with proper normals and texture coords */
IMesh* CGeometryCreator::createConeMesh(f32 radius, f32 length, u32 tesselation, const video::SColor& colorTop, const video::SColor& colorBottom, f32 oblique)
{
SMeshBuffer* buffer = new SMeshBuffer();
const f32 angleStep = (core::PI * 2.f ) / tesselation;
const f32 angleStepHalf = angleStep*0.5f;
video::S3DVertex v;
u32 i;
v.Color = colorTop;
for ( i = 0; i != tesselation; ++i )
{
f32 angle = angleStep * f32(i);
v.Pos.X = radius * cosf(angle);
v.Pos.Y = 0.f;
v.Pos.Z = radius * sinf(angle);
v.Normal = v.Pos;
v.Normal.normalize();
buffer->Vertices.push_back(v);
angle += angleStepHalf;
v.Pos.X = radius * cosf(angle);
v.Pos.Y = 0.f;
v.Pos.Z = radius * sinf(angle);
v.Normal = v.Pos;
v.Normal.normalize();
buffer->Vertices.push_back(v);
}
const u32 nonWrappedSize = buffer->Vertices.size() - 1;
// close top
v.Pos.X = oblique;
v.Pos.Y = length;
v.Pos.Z = 0.f;
v.Normal.X = 0.f;
v.Normal.Y = 1.f;
v.Normal.Z = 0.f;
buffer->Vertices.push_back(v);
u32 index = buffer->Vertices.size() - 1;
for ( i = 0; i != nonWrappedSize; i += 1 )
{
buffer->Indices.push_back ( i + 0 );
buffer->Indices.push_back ( index );
buffer->Indices.push_back ( i + 1 );
}
buffer->Indices.push_back(i + 0);
buffer->Indices.push_back(index);
buffer->Indices.push_back(0);
// close down
v.Color = colorBottom;
v.Pos.X = 0.f;
v.Pos.Y = 0.f;
v.Pos.Z = 0.f;
v.Normal.X = 0.f;
v.Normal.Y = -1.f;
v.Normal.Z = 0.f;
buffer->Vertices.push_back(v);
index = buffer->Vertices.size() - 1;
for ( i = 0; i != nonWrappedSize; i += 1 )
{
buffer->Indices.push_back(index);
buffer->Indices.push_back(i + 0);
buffer->Indices.push_back(i + 1);
}
buffer->Indices.push_back(index);
buffer->Indices.push_back(i + 0);
buffer->Indices.push_back(0);
buffer->recalculateBoundingBox();
SMesh* mesh = new SMesh();
mesh->addMeshBuffer(buffer);
buffer->drop();
mesh->recalculateBoundingBox();
return mesh;
}
} // end namespace scene
} // end namespace irr