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/**************************************************************************/
/* Copyright 2009 Tim Day */
/* */
/* This file is part of Fracplanet */
/* */
/* Fracplanet is free software: you can redistribute it and/or modify */
/* it under the terms of the GNU General Public License as published by */
/* the Free Software Foundation, either version 3 of the License, or */
/* (at your option) any later version. */
/* */
/* Fracplanet is distributed in the hope that it will be useful, */
/* but WITHOUT ANY WARRANTY; without even the implied warranty of */
/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */
/* GNU General Public License for more details. */
/* */
/* You should have received a copy of the GNU General Public License */
/* along with Fracplanet. If not, see <http://www.gnu.org/licenses/>. */
/**************************************************************************/
#include "precompiled.h"
#include "triangle_mesh_cloud.h"
#include "noise.h"
#include "matrix34.h"
#include "parameters_render.h"
TriangleMeshCloud::TriangleMeshCloud(Progress* progress)
:TriangleMesh(progress)
{}
TriangleMeshCloud::~TriangleMeshCloud()
{}
void TriangleMeshCloud::write_povray(std::ofstream& out,const ParametersSave&,const ParametersCloud&) const
{
// Double illuminate so underside of clouds is white.
// No-shadow so clouds don't cast crazy dark shadows.
TriangleMesh::write_povray(out,false,true,true);
}
void TriangleMeshCloud::write_blender(std::ofstream& out,const ParametersSave& parameters_save,const ParametersCloud&,const std::string& mesh_name) const
{
TriangleMesh::write_blender
(
out,
mesh_name+".cloud",
(parameters_save.blender_per_vertex_alpha ? 0 : ¶meters_save.parameters_render->background_colour_low)
);
}
namespace
{
class ScanConvertHelper : public ScanConvertBackend
{
public:
ScanConvertHelper(Raster<uchar>& image,const boost::array<float,3>& vertex_colours)
:ScanConvertBackend(image.width(),image.height())
,_image(image)
,_vertex_colours(vertex_colours)
{}
virtual ~ScanConvertHelper()
{}
virtual void scan_convert_backend(uint /*y*/,const ScanEdge& /*edge0*/,const ScanEdge& /*edge1*/) const
{}
virtual void subdivide(const boost::array<XYZ,3>& /*v*/,const XYZ& /*m*/,const ScanConverter& /*scan_converter*/) const
{}
private:
Raster<uchar>& _image;
const boost::array<float,3>& _vertex_colours;
};
}
void TriangleMeshCloud::render_texture(Raster<uchar>& image) const
{
assert(false);
image.fill(0);
for (uint i=0;i<triangles();i++)
{
const Triangle& t=triangle(i);
const boost::array<XYZ,3> vertex_positions
={{
vertex(t.vertex(0)).position(),
vertex(t.vertex(1)).position(),
vertex(t.vertex(2)).position()
}};
const boost::array<float,3> vertex_colours
={{
FloatRGBA(vertex(t.vertex(0)).colour(0)).a,
FloatRGBA(vertex(t.vertex(1)).colour(0)).a,
FloatRGBA(vertex(t.vertex(2)).colour(0)).a
}};
ScanConvertHelper scan_convert_backend(image,vertex_colours);
geometry().scan_convert
(
vertex_positions,
scan_convert_backend
);
}
}
void TriangleMeshCloud::do_cloud(const ParametersCloud& parameters)
{
compute_vertex_normals();
progress_start(100,"Cloud colouring");
const ByteRGBA c(parameters.colour);
//! \todo Wire up terms, decay and base fequency and thresholds
MultiscaleNoise noise(parameters.seed,6,0.5);
for (uint i=0;i<vertices();i++)
{
progress_step((100*i)/vertices());
const float v=0.5+0.5*noise(4.0f*vertex(i).position());
const float v_min=0.5f;
const float v_max=0.6f;
const float v_k=1.0f/(v_max-v_min);
const float vs=std::min(1.0f,std::max(0.0f,(v-v_min)*v_k));
vertex(i).colour(0,ByteRGBA(c.r,c.g,c.b,static_cast<uint>(255.0*vs)));
// Set other colour (unused) to red for debug
vertex(i).colour(1,ByteRGBA(255,0,0,255));
}
progress_complete("Cloud colouring completed");
// TODO: Eliminate all-transparent triangles & unused vertices.
// Leave if nothing left
// TODO: Bias weather into temperate bands (maybe not)
progress_start(100,"Weather systems");
Random01 r01(parameters.seed);
const uint steps=100*vertices();
uint step=0;
for (uint i=0;i<parameters.weather_systems;i++)
{
const uint random_vertex=static_cast<uint>(r01()*vertices());
const XYZ position(vertex(random_vertex).position());
const XYZ axis(geometry().up(position));
// Rotate opposite direction in other hemisphere
const float strength=r01()*(position.z<0.0 ? -M_PI : M_PI);
for (uint j=0;j<vertices();j++)
{
progress_step((100*step)/steps);
step++;
const XYZ p(vertex(j).position());
const XYZ pn=geometry().up(p);
const float pna=pn%axis;
if (pna>0.0f) // Don't create same feature on other side of planet (actually the distance would be big so could drop this)
{
const float distance=(p-position).magnitude();
const float rotation_angle=strength*exp(-10.0*distance);
// Now rotate p about axis through position by the rotation angle
// TODO: Optimise! axis and position is the same for all points; we're constantly recomputing the basis change matrices.
// Create a stateful version of Matrix34RotateAboutAxisThrough.
vertex(j).position
(
Matrix34RotateAboutAxisThrough(axis,rotation_angle,position)*p
);
}
}
}
progress_complete("Weather systems completed");
_triangle_switch_colour=triangles();
}
TriangleMeshCloudPlanet::TriangleMeshCloudPlanet(const ParametersCloud& parameters,Progress* progress)
:TriangleMesh(progress)
,TriangleMeshCloud(progress)
,TriangleMeshSubdividedIcosahedron(1.0+parameters.cloudbase,parameters.subdivisions,parameters.subdivisions,parameters.seed,XYZ(0.0,0.0,0.0),progress)
{
do_cloud(parameters);
}
TriangleMeshCloudFlat::TriangleMeshCloudFlat(const ParametersCloud& parameters,Progress* progress)
:TriangleMesh(progress)
,TriangleMeshCloud(progress)
,TriangleMeshFlat(parameters.object_type,parameters.cloudbase,parameters.seed,progress)
{
subdivide(parameters.subdivisions,parameters.subdivisions,XYZ(0.0,0.0,0.0));
do_cloud(parameters);
}
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