Scene *readHeights(char* fn) {
int width, height;
unsigned char *height_map;
height_map = readBMP(fn, width, height);
if (!height_map)
{
fl_alert("Error loading height map\n");
return false;
}
Scene * ret = new Scene();
//TODO: customize mat
Material * mat = new Material();
mat->kd = vec3f(1.0, 1.0, 1.0);
//extract the points
Trimesh * trimesh = new Trimesh(ret, mat, &ret->transformRoot);
for (int y = 0; y < height; ++y) {
for (int x = 0; x < width; ++x) {
int pos = y * width + x;
unsigned char pixel[3];
memcpy(pixel, height_map + pos * 3, 3);
double height = double(pixel[0] + pixel[1] + pixel[2]) / 3 / 128;
vec3f point(x, y, height);
trimesh->addVertex(point);
if (x > 0 && y > 0) { //link the points
trimesh->addFace(pos, pos - 1, pos - 1 - width);
trimesh->addFace(pos, pos - 1 - width, pos - width);
}
}
}
char *error;
if (error = trimesh->doubleCheck())
throw ParseError(error);
//add a trimesh
ret->add(trimesh);
//add a pointlight
PointLight* point_light = new PointLight(ret, vec3f(width, height, 10), vec3f(1.0, 1.0, 1.0));
ret->add(point_light);
//set the camerea
//TODO: calculate the correct viewing distance;
vec3f map_center((double)width / 2 - 0.5, (double)height / 2 - 0.5, 0.5);
double camera_distance = (double)width + 3.0;
vec3f camera_pos(0, -camera_distance, 2 * camera_distance);
camera_pos += map_center;
ret->getCamera()->setEye(camera_pos);
ret->getCamera()->setLook((map_center - camera_pos).normalize(), vec3f(0, 0, 1).normalize());
return ret;
}
static void processTrimesh( string name, Obj *child, Scene *scene,
const mmap& materials, TransformNode *transform )
{
Material *mat;
if( hasField( child, "material" ) )
mat = getMaterial( getField( child, "material" ), materials );
else
mat = new Material();
Trimesh *tmesh = new Trimesh( scene, mat, transform);
const mytuple &points = getField( child, "points" )->getTuple();
for( mytuple::const_iterator pi = points.begin(); pi != points.end(); ++pi )
tmesh->addVertex( tupleToVec( *pi ) );
const mytuple &faces = getField( child, "faces" )->getTuple();
for( mytuple::const_iterator fi = faces.begin(); fi != faces.end(); ++fi )
{
const mytuple &pointids = (*fi)->getTuple();
// triangulate here and now. assume the poly is
// concave and we can triangulate using an arbitrary fan
if( pointids.size() < 3 )
throw ParseError( "Faces must have at least 3 vertices." );
mytuple::const_iterator i = pointids.begin();
int a = (int) (*i++)->getScalar();
int b = (int) (*i++)->getScalar();
while( i != pointids.end() )
{
int c = (int) (*i++)->getScalar();
if( !tmesh->addFace(a,b,c) )
throw ParseError( "Bad face in trimesh." );
b = c;
}
}
bool generateNormals = false;
maybeExtractField( child, "gennormals", generateNormals );
if( generateNormals )
tmesh->generateNormals();
if( hasField( child, "materials" ) )
{
const mytuple &mats = getField( child, "materials" )->getTuple();
for( mytuple::const_iterator mi = mats.begin(); mi != mats.end(); ++mi )
tmesh->addMaterial( getMaterial( *mi, materials ) );
}
if( hasField( child, "normals" ) )
{
const mytuple &norms = getField( child, "normals" )->getTuple();
for( mytuple::const_iterator ni = norms.begin(); ni != norms.end(); ++ni )
tmesh->addNormal( tupleToVec( *ni ) );
}
char *error;
if( error = tmesh->doubleCheck() )
throw ParseError( error );
scene->add(tmesh);
}
void Parser::parseTrimesh(Scene* scene, TransformNode* transform, const Material& mat)
{
Trimesh* tmesh = new Trimesh( scene, new Material(mat), transform);
_tokenizer.Read( TRIMESH );
_tokenizer.Read( LBRACE );
bool generateNormals( true );
list<Vec3d> faces;
char* error;
for( ;; )
{
const Token* t = _tokenizer.Peek();
switch( t->kind() )
{
case GENNORMALS:
_tokenizer.Read( GENNORMALS );
_tokenizer.Read( SEMICOLON );
generateNormals = true;
break;
case MATERIAL:
tmesh->setMaterial( parseMaterialExpression( scene, mat ) );
break;
case NAME:
parseIdentExpression();
break;
case MATERIALS:
_tokenizer.Read( MATERIALS );
_tokenizer.Read( EQUALS );
_tokenizer.Read( LPAREN );
if( RPAREN != _tokenizer.Peek()->kind() )
{
tmesh->addMaterial( parseMaterial( scene, tmesh->getMaterial() ) );
for( ;; )
{
const Token* nextToken = _tokenizer.Peek();
if( RPAREN == nextToken->kind() )
break;
_tokenizer.Read( COMMA );
tmesh->addMaterial( parseMaterial( scene, tmesh->getMaterial() ) );
}
}
_tokenizer.Read( RPAREN );
_tokenizer.Read( SEMICOLON );
break;
case NORMALS:
_tokenizer.Read( NORMALS );
_tokenizer.Read( EQUALS );
_tokenizer.Read( LPAREN );
if( RPAREN != _tokenizer.Peek()->kind() )
{
tmesh->addNormal( parseVec3d() );
for( ;; )
{
const Token* nextToken = _tokenizer.Peek();
if( RPAREN == nextToken->kind() )
break;
_tokenizer.Read( COMMA );
tmesh->addNormal( parseVec3d() );
}
}
_tokenizer.Read( RPAREN );
_tokenizer.Read( SEMICOLON );
break;
case FACES:
_tokenizer.Read( FACES );
_tokenizer.Read( EQUALS );
_tokenizer.Read( LPAREN );
if( RPAREN != _tokenizer.Peek()->kind() )
{
parseFaces( faces );
for( ;; )
{
const Token* nextToken = _tokenizer.Peek();
if( RPAREN == nextToken->kind() )
break;
_tokenizer.Read( COMMA );
parseFaces( faces );
}
}
_tokenizer.Read( RPAREN );
_tokenizer.Read( SEMICOLON );
break;
case POLYPOINTS:
_tokenizer.Read( POLYPOINTS );
_tokenizer.Read( EQUALS );
_tokenizer.Read( LPAREN );
if( RPAREN != _tokenizer.Peek()->kind() )
{
tmesh->addVertex( parseVec3d() );
for( ;; )
{
const Token* nextToken = _tokenizer.Peek();
if( RPAREN == nextToken->kind() )
break;
_tokenizer.Read( COMMA );
tmesh->addVertex( parseVec3d() );
}
}
_tokenizer.Read( RPAREN );
_tokenizer.Read( SEMICOLON );
break;
case RBRACE:
{
_tokenizer.Read( RBRACE );
// Now add all the faces into the trimesh, since hopefully
// the vertices have been parsed out
for( list<Vec3d>::const_iterator vitr = faces.begin(); vitr != faces.end(); vitr++ )
{
if( !tmesh->addFace( (*vitr)[0], (*vitr)[1], (*vitr)[2] ) )
{
ostringstream oss;
oss << "Bad face in trimesh: (" << (*vitr)[0] << ", " << (*vitr)[1] <<
", " << (*vitr)[2] << ")";
throw ParserException( oss.str() );
}
}
if( generateNormals )
tmesh->generateNormals();
if( error = tmesh->doubleCheck() )
throw ParserException( error );
scene->add( tmesh );
return;
}
default:
throw SyntaxErrorException( "Expected: trimesh attributes", _tokenizer );
}
}
}
