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extern/opennurbs/opennurbs_photogrammetry.cpp

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/* $NoKeywords: $ */
/*
//
// Copyright (c) 1993-2013 Robert McNeel & Associates. All rights reserved.
// OpenNURBS, Rhinoceros, and Rhino3D are registered trademarks of Robert
// McNeel & Associates.
//
// THIS SOFTWARE IS PROVIDED "AS IS" WITHOUT EXPRESS OR IMPLIED WARRANTY.
// ALL IMPLIED WARRANTIES OF FITNESS FOR ANY PARTICULAR PURPOSE AND OF
// MERCHANTABILITY ARE HEREBY DISCLAIMED.
//
// For complete openNURBS copyright information see <http://www.opennurbs.org>.
//
////////////////////////////////////////////////////////////////
*/
#include "opennurbs.h"
#if !defined(ON_COMPILING_OPENNURBS)
// This check is included in all opennurbs source .c and .cpp files to insure
// ON_COMPILING_OPENNURBS is defined when opennurbs source is compiled.
// When opennurbs source is being compiled, ON_COMPILING_OPENNURBS is defined
// and the opennurbs .h files alter what is declared and how it is declared.
#error ON_COMPILING_OPENNURBS must be defined when compiling opennurbs
#endif
ON_AerialPhotoImage::ON_AerialPhotoImage()
: m_id(ON_nil_uuid)
, m_image_width_pixels(0)
, m_image_height_pixels(0)
{
}
void ON_AerialPhotoImage::Unset()
{
m_name.Destroy();
m_id = ON_nil_uuid;
m_camera_position.Unset();
m_image_frustum.Unset();
m_image_file_name.Destroy();
m_image_width_pixels = 0;
m_image_height_pixels = 0;
}
void ON_AerialPhotoImage::SetName(
const wchar_t* name
)
{
m_name = name;
}
void ON_AerialPhotoImage::GetName(
ON_wString& name
) const
{
name = m_name.Array();
}
void ON_AerialPhotoImage::SetId( ON_UUID id )
{
m_id = id;
}
ON_UUID ON_AerialPhotoImage::Id() const
{
return m_id;
}
bool ON_AerialPhotoImage::CameraPositionIsSet() const
{
return m_camera_position.IsSet();
}
bool ON_AerialPhotoImage::CameraLocationIsSet() const
{
return m_camera_position.LocationIsSet();
}
bool ON_AerialPhotoImage::CameraOrientationIsSet() const
{
return m_camera_position.OrientationIsSet();
}
void ON_AerialPhotoImage::SetCameraPosition(
ON_AerialPhotoCameraPosition camera_position
)
{
m_camera_position = camera_position;
}
void ON_AerialPhotoImage::GetCameraPosition(
ON_AerialPhotoCameraPosition& camera_position
) const
{
camera_position = m_camera_position;
}
void ON_AerialPhotoImage::UnsetCameraPosition()
{
m_camera_position.Unset();
}
/////////////////////////////////////////////////////////
//
// Image frustum interface
//
bool ON_AerialPhotoImage::ImageFrustumIsSet() const
{
return m_image_frustum.IsSet();
}
void ON_AerialPhotoImage::SetImageFrustum(
ON_AerialPhotoImageFrustum image_frustum
)
{
m_image_frustum = image_frustum;
}
void ON_AerialPhotoImage::GetImageFrustum(
ON_AerialPhotoImageFrustum& image_frustum
) const
{
image_frustum = m_image_frustum;
}
void ON_AerialPhotoImage::UnsetImageFrustum()
{
m_image_frustum.Unset();
}
bool ON_AerialPhotoImage::ImageFileNameIsSet() const
{
return (m_image_file_name.Length() > 0);
}
bool ON_AerialPhotoImage::ImageSizeIsSet() const
{
return (m_image_width_pixels > 0 && m_image_height_pixels > 0);
}
bool ON_AerialPhotoImage::SetImageSize(
int image_width_pixels,
int image_height_pixels
)
{
bool rc = false;
if ( image_width_pixels > 0 && image_height_pixels > 0 )
{
m_image_width_pixels = image_width_pixels;
m_image_height_pixels = image_height_pixels;
rc = true;
}
else
UnsetImageSize();
return rc;
}
bool ON_AerialPhotoImage::GetImageSize(
int* width_pixels,
int* height_pixels
) const
{
if ( 0 != width_pixels )
*width_pixels = m_image_width_pixels;
if ( 0 != height_pixels )
*height_pixels = m_image_height_pixels;
return ImageSizeIsSet();
}
void ON_AerialPhotoImage::UnsetImageSize()
{
m_image_width_pixels = 0;
m_image_height_pixels = 0;
}
void ON_AerialPhotoImage::SetImageFileName(
const wchar_t* image_file_name
)
{
m_image_file_name = image_file_name;
}
void ON_AerialPhotoImage::GetImageFileName(
ON_wString& image_file_name
) const
{
// copy array
const wchar_t* s = static_cast< const wchar_t* >(m_image_file_name);
image_file_name = s;
}
void ON_AerialPhotoImage::UnsetImageFileName()
{
m_image_file_name.Destroy();
}
ON_AerialPhotoImageFrustum::ON_AerialPhotoImageFrustum()
{
Unset();
}
bool ON_AerialPhotoImageFrustum::IsSet() const
{
return HeightIsSet() && CornersAreSet() && UnitSystemIsSet();
}
void ON_AerialPhotoImageFrustum::Unset()
{
m_height = ON_UNSET_VALUE;
m_corners[0] = ON_2dPoint::UnsetPoint;
m_corners[1] = ON_2dPoint::UnsetPoint;
m_corners[2] = ON_2dPoint::UnsetPoint;
m_corners[3] = ON_2dPoint::UnsetPoint;
m_unit_system = ON_UnitSystem::None;
}
bool ON_AerialPhotoImageFrustum::HeightIsSet() const
{
return (m_height > 0.0 && ON_IsValid(m_height));
}
bool ON_AerialPhotoImageFrustum::CornersAreSet() const
{
for(;;)
{
if ( !m_corners[0].IsValid() )
break;
if ( !m_corners[1].IsValid() )
break;
if ( !m_corners[2].IsValid() )
break;
if ( !m_corners[3].IsValid() )
break;
// corners must form a non-empty convex 2d region and
// be in counter-clockwise order. They can be a
// the corners of a 3 or 4 sided region.
double max_z = 0.0;
double z;
ON_2dVector A, B;
for ( int i = 0; i < 4; i++ )
{
A = m_corners[(i+3)%4] - m_corners[i];
B = m_corners[(i+1)%4] - m_corners[i];
z = B.x*A.y - A.x*B.y;
if (z >= 0.0 && ON_IsValid(z))
{
if ( z > max_z )
max_z = z;
continue;
}
return false;
}
if ( max_z > 0.0 )
return true;
break;
}
return false;
}
bool ON_AerialPhotoImageFrustum::UnitSystemIsSet() const
{
return (m_unit_system.IsSet());
}
ON_AerialPhotoCameraPosition::ON_AerialPhotoCameraPosition()
: m_status(0)
{
Unset();
}
void ON_AerialPhotoCameraPosition::Unset()
{
UnsetUnitSystem();
UnsetLocation();
UnsetOrientation();
}
bool ON_AerialPhotoCameraPosition::IsSet() const
{
return UnitSystemIsSet() && LocationIsSet() && OrientationIsSet();
}
bool ON_AerialPhotoCameraPosition::UnitSystemIsSet() const
{
return m_unit_system.IsSet();
}
bool ON_AerialPhotoCameraPosition::SetUnitSystem( ON::LengthUnitSystem unit_system )
{
if ( ON::LengthUnitSystem::None != unit_system
&& ON::LengthUnitSystem::CustomUnits != unit_system
&& unit_system == ON::LengthUnitSystemFromUnsigned(static_cast<unsigned int>(unit_system))
)
{
m_unit_system = ON_UnitSystem(unit_system);
}
else
Unset();
return UnitSystemIsSet();
}
bool ON_AerialPhotoCameraPosition::SetUnitSystem ( ON_UnitSystem unit_system )
{
if ( unit_system.IsSet() )
m_unit_system = unit_system;
else
Unset();
return UnitSystemIsSet();
}
ON_UnitSystem ON_AerialPhotoCameraPosition::UnitSystem() const
{
return m_unit_system;
}
bool ON_AerialPhotoCameraPosition::GetUnitSystem( ON_UnitSystem& unit_system ) const
{
unit_system = m_unit_system;
return UnitSystemIsSet();
}
void ON_AerialPhotoCameraPosition::UnsetUnitSystem()
{
m_unit_system = ON_UnitSystem(ON::LengthUnitSystem::None);
}
bool ON_AerialPhotoCameraPosition::LocationIsSet() const
{
return m_location.IsValid();
}
bool ON_AerialPhotoCameraPosition::SetLocation(
ON_3dPoint camera_location
)
{
const bool rc = camera_location.IsValid();
if (rc)
m_location = camera_location;
else
UnsetLocation();
return rc;
}
bool ON_AerialPhotoCameraPosition::GetLocation(
ON_3dPoint& camera_location
) const
{
camera_location = Location();
return LocationIsSet();
}
ON_3dPoint ON_AerialPhotoCameraPosition::Location() const
{
return m_location;
}
void ON_AerialPhotoCameraPosition::UnsetLocation()
{
m_status &= 0xFE; // clear bit 1
m_location = ON_3dPoint::UnsetPoint;
}
bool ON_AerialPhotoCameraPosition::OrientationIsSet() const
{
return ( 0 != (m_status & 2)
&& m_orientation_angles_radians.IsValid()
&& m_orientation_angles_degrees.IsValid()
&& m_orientation_right.IsValid()
&& m_orientation_up.IsValid()
&& m_orientation_direction.IsValid()
&& m_orientation_rotation.IsValid()
);
}
void ON_AerialPhotoCameraPosition::UnsetOrientation()
{
m_status &= 0xFD; // clear bit 2
m_orientation_angles_radians.Set(ON_UNSET_VALUE,ON_UNSET_VALUE,ON_UNSET_VALUE);
m_orientation_angles_degrees.Set(ON_UNSET_VALUE,ON_UNSET_VALUE,ON_UNSET_VALUE);
m_orientation_rotation = ON_Xform::Zero4x4;
m_orientation_right = ON_3dVector::ZeroVector;
m_orientation_up = ON_3dVector::ZeroVector;
m_orientation_direction = ON_3dVector::ZeroVector;
}
bool ON_AerialPhotoCameraPosition::GetOrientationRotation(
ON_Xform& camera_rotaion
) const
{
camera_rotaion = m_orientation_rotation;
return (0 != (m_status & 2));
}
/*
Description:
Get a right handed ortho normal camera frame.
Parameters:
camera_X - [out]
world coordinate unit vector pointing to the right in the camera image
= OrientationRotation * (1,0,0)
camera_Y - [out]
world coordinate unit vector in the camera up direction.
= OrientationRotation * (0,1,0)
camera_Z - [out]
world coordinate unit vector pointing into the cameara (from the
image toward the camera).
= OrientationRotation * (0,0,1)
*/
bool ON_AerialPhotoCameraPosition::GetOrientationFrame(
ON_3dVector& camera_X,
ON_3dVector& camera_Y,
ON_3dVector& camera_Z
) const
{
camera_X.x = m_orientation_rotation.m_xform[0][0];
camera_X.y = m_orientation_rotation.m_xform[1][0];
camera_X.z = m_orientation_rotation.m_xform[2][0];
camera_Y.x = m_orientation_rotation.m_xform[0][1];
camera_Y.y = m_orientation_rotation.m_xform[1][1];
camera_Y.z = m_orientation_rotation.m_xform[2][1];
camera_Z.x = m_orientation_rotation.m_xform[0][2];
camera_Z.y = m_orientation_rotation.m_xform[1][2];
camera_Z.z = m_orientation_rotation.m_xform[2][2];
return (0 != (m_status & 2));
}
ON_Xform ON_AerialPhotoCameraPosition::OrientationRotation() const
{
return m_orientation_rotation;
}
bool ON_AerialPhotoCameraPosition::SetOrientationVectors(
ON_3dVector camera_up,
ON_3dVector camera_right,
ON_3dVector camera_direction
)
{
ON_3dVector X(camera_right);
ON_3dVector Y(camera_up);
ON_3dVector Z(-camera_direction);
bool bHaveX = ( X.IsValid() && X.Unitize() );
bool bHaveY = ( Y.IsValid() && Y.Unitize() );
bool bHaveZ = ( Z.IsValid() && Z.Unitize() );
if ( !bHaveX && bHaveY && bHaveZ )
{
X = ON_CrossProduct(Y,Z);
bHaveX = X.Unitize();
if ( bHaveX )
camera_right = X;
}
else if ( !bHaveY && bHaveZ && bHaveX )
{
Y = ON_CrossProduct(Z,X);
bHaveY = Y.Unitize();
if ( bHaveY )
camera_up = Y;
}
else if ( !bHaveZ && bHaveX && bHaveY )
{
Z = ON_CrossProduct(X,Y);
bHaveZ = Z.Unitize();
if ( bHaveZ )
camera_direction = -Z;
}
bool rc = false;
for (;;)
{
if ( !bHaveX || !bHaveY || !bHaveZ )
break;
double max_dot = 0.0;
double d = fabs(X*Y);
if ( d > max_dot )
max_dot = d;
d = fabs(Y*Z);
if ( d > max_dot )
max_dot = d;
d = fabs(Z*X);
if ( d > max_dot )
max_dot = d;
if ( max_dot > 1.0e-8 )
break;
d = Z*ON_CrossProduct(X,Y);
if ( !(d > 0.0) )
break;
ON_Xform R;
R.m_xform[0][0] = X.x; R.m_xform[0][1] = Y.x; R.m_xform[0][2] = Z.x; R.m_xform[0][3] = 0.0;
R.m_xform[1][0] = X.y; R.m_xform[1][1] = Y.y; R.m_xform[1][2] = Z.y; R.m_xform[1][3] = 0.0;
R.m_xform[2][0] = X.z; R.m_xform[2][1] = Y.z; R.m_xform[2][2] = Z.z; R.m_xform[2][3] = 0.0;
R.m_xform[3][0] = 0.0; R.m_xform[3][1] = 0.0; R.m_xform[3][2] = 0.0; R.m_xform[3][3] = 1.0;
rc = SetOrientationRotation(R);
if (rc)
{
// preserve exact values of input parameters
m_orientation_right = camera_right;
m_orientation_up = camera_up;
m_orientation_direction = camera_direction;
}
break;
}
if (!rc)
{
UnsetOrientation();
}
return rc;
}
bool ON_AerialPhotoCameraPosition::SetOrientationRotation(
ON_Xform camera_rotation
)
{
m_orientation_rotation = camera_rotation;
const ON_3dVector X(camera_rotation.m_xform[0][0],camera_rotation.m_xform[1][0],camera_rotation.m_xform[2][0]);
const ON_3dVector Y(camera_rotation.m_xform[0][1],camera_rotation.m_xform[1][1],camera_rotation.m_xform[2][1]);
const ON_3dVector Z(camera_rotation.m_xform[0][2],camera_rotation.m_xform[1][2],camera_rotation.m_xform[2][2]);
m_orientation_right = X;
m_orientation_up = Y;
m_orientation_direction = -Z;
double s1, c1, s2, c2, s3, c3;
s2 = Z.x;
double a = 1.0 - s2*s2;
c2 = (a > 0.0) ? sqrt(a) : 0.0;
if ( fabs(c2) <= ON_EPSILON || fabs(s2) >= 1.0-ON_EPSILON )
{
s2 = (s2 < 0.0) ? -1.0 : 1.0;
c2 = 0.0;
}
else if ( fabs(s2) <= ON_EPSILON || fabs(c2) >= 1.0-ON_EPSILON )
{
c2 = (c2 < 0.0) ? -1.0 : 1.0;
s2 = 0.0;
}
if ( c2 > 0.0 )
{
s1 = -Z.y/c2;
c1 = Z.z/c2;
s3 = -Y.x/c2;
c3 = X.x/c2;
}
else
{
s1 = 0.0;
c1 = 1.0;
s3 = ( X.y == Y.z ) ? X.y : 0.5*(X.y + Y.z);
c3 = ( Y.y == -X.z ) ? Y.y : 0.5*(Y.y - X.z);
}
m_orientation_angles_radians.x = atan2(s1,c1);
m_orientation_angles_radians.y = atan2(s2,c2);
m_orientation_angles_radians.z = atan2(s2,c3);
m_orientation_angles_degrees.x = m_orientation_angles_radians.x*180.0/ON_PI;
m_orientation_angles_degrees.y = m_orientation_angles_radians.y*180.0/ON_PI;
m_orientation_angles_degrees.z = m_orientation_angles_radians.z*180.0/ON_PI;
m_status |= 2;
return true;
}
bool ON_AerialPhotoCameraPosition::SetOrientationAnglesDegrees(
double omega_degrees,
double phi_degrees,
double kappa_degrees
)
{
bool rc = false;
if ( ON_IsValid(omega_degrees) && ON_IsValid(phi_degrees) && ON_IsValid(kappa_degrees) )
{
rc = SetOrientationAnglesRadians(omega_degrees*ON_PI/180.0,phi_degrees*ON_PI/180.0,kappa_degrees*ON_PI/180.0);
// Directly set m_camera_angles_degrees after SetCameraAnglesRadians()
// so we don't loose a few bits of precision lost by converting to radians
// and then converting back to degrees.
m_orientation_angles_degrees.Set(omega_degrees,phi_degrees,kappa_degrees);
}
else
{
UnsetOrientation();
}
return rc;
}
bool ON_AerialPhotoCameraPosition::SetOrientationAnglesRadians(
double omega_radians,
double phi_radians,
double kappa_radians
)
{
bool rc = false;
if ( ON_IsValid(omega_radians) && ON_IsValid(phi_radians) && ON_IsValid(kappa_radians) )
{
m_orientation_angles_radians.Set(omega_radians,phi_radians,kappa_radians);
m_orientation_angles_degrees.Set(omega_radians*180.0/ON_PI,phi_radians*180.0/ON_PI,kappa_radians*180.0/ON_PI);
const double c1 = cos(omega_radians);
const double s1 = sin(omega_radians);
const double c2 = cos(phi_radians);
const double s2 = sin(phi_radians);
const double c3 = cos(kappa_radians);
const double s3 = sin(kappa_radians);
const ON_3dVector X( c3*c2, s3*c1 + c3*s2*s1, s3*s1 - c3*s2*c1);
const ON_3dVector Y(-s3*c2, c3*c1 - s3*s2*s1, c3*s1 + s3*s2*c1);
const ON_3dVector Z( s2, -c2*s1, c2*c1);
ON_Xform R;
R.m_xform[0][0] = X.x; R.m_xform[0][1] = Y.x; R.m_xform[0][2] = Z.x; R.m_xform[0][3] = 0.0;
R.m_xform[1][0] = X.y; R.m_xform[1][1] = Y.y; R.m_xform[1][2] = Z.y; R.m_xform[1][3] = 0.0;
R.m_xform[2][0] = X.z; R.m_xform[2][1] = Y.z; R.m_xform[2][2] = Z.z; R.m_xform[2][3] = 0.0;
R.m_xform[3][0] = 0.0; R.m_xform[3][1] = 0.0; R.m_xform[3][2] = 0.0; R.m_xform[3][3] = 1.0;
m_orientation_rotation = R;
m_orientation_right = X;
m_orientation_up = Y;
m_orientation_direction = -Z;
m_status |= 2;
rc = true;
{
// Debugging validation tests
const ON_3dVector x0(1.0,0.0,0.0);
const ON_3dVector y0(0.0,1.0,0.0);
const ON_3dVector z0(0.0,0.0,1.0);
const ON_3dVector x1 = x0;
const ON_3dVector y1 = c1*y0 + s1*z0;
const ON_3dVector z1 = -s1*y0 + c1*z0;
const ON_3dVector y2 = y1;
const ON_3dVector z2 = s2*x1 + c2*z1;
const ON_3dVector x2 = c2*x1 - s2*z1;
const ON_3dVector z3 = z2;
const ON_3dVector x3 = c3*x2 + s3*y2;
const ON_3dVector y3 = -s3*x2 + c3*y2;
/*
const ON_3dVector x1 = x0;
const ON_3dVector y1 = (0.0, c1, s1);
const ON_3dVector z1 = (0.0, -s1, c1);
const ON_3dVector x2 = (c2, s2*s1, -s2*c1); // c2*x1 - s2*z1;
const ON_3dVector y2 = (0.0, c1, s1);
const ON_3dVector z2 = (s2, -c2*s1, c2*c1); // s2*x1 + c2*z1
*/
ON_Xform r1;
r1.Rotation(omega_radians,x0,ON_3dPoint::Origin);
ON_3dVector r1y0 = r1*y0;
ON_Xform r2;
r2.Rotation(phi_radians,r1y0,ON_3dPoint::Origin);
ON_3dVector r2r1z0 = r2*r1*z0;
ON_Xform r3;
r3.Rotation(kappa_radians,r2r1z0,ON_3dPoint::Origin);
ON_Xform r321 = r3*r2*r1;
ON_Xform zero = r321 - R;
double a, b;
double max_zero = 0.0;
for ( int i = 0; i < 4; i++ ) for ( int j = 0; j < 4; j++ )
{
a = fabs(zero[i][j]);
if (a > max_zero )
max_zero = a;
}
b = fabs((x3-X).MaximumCoordinate());
if ( b > max_zero )
max_zero = b;
b = fabs((y3-Y).MaximumCoordinate());
if ( b > max_zero )
max_zero = b;
b = fabs((z3-Z).MaximumCoordinate());
if ( b > max_zero )
max_zero = b;
if ( max_zero > 1.0e-15 )
ON_ERROR("Transform trauma");
}
}
else
{
UnsetOrientation();
}
return rc;
}
bool ON_AerialPhotoImage::GetViewProjection(
ON_BoundingBox target_bbox,
ON_Viewport& viewport
) const
{
viewport = ON_Viewport::DefaultTopViewYUp;
if ( !this->ImageSizeIsSet() )
return false;
const int image_width_pixels = m_image_width_pixels;
const int image_height_pixels = m_image_height_pixels;
const ON_AerialPhotoImageFrustum& pg_if( m_image_frustum );
if ( !pg_if.IsSet() )
return false;
const ON_AerialPhotoCameraPosition& pg_cp( m_camera_position );
if ( !pg_cp.LocationIsSet() )
return false;
if ( !pg_cp.OrientationIsSet() )
return false;
ON_3dPoint camera_location;
if ( !pg_cp.GetLocation(camera_location) || !camera_location.IsValid() )
return false;
ON_Xform camera_rotation;
if ( !pg_cp.GetOrientationRotation(camera_rotation)
|| !camera_rotation.IsValid()
)
return false;
ON_Plane camera_plane;
if (!pg_cp.GetOrientationFrame(camera_plane.xaxis,camera_plane.yaxis,camera_plane.zaxis))
return false;
camera_plane.origin = camera_location;
camera_plane.UpdateEquation();
const double frustum_to_position_unit_scale = ON::UnitScale( pg_if.m_unit_system, pg_cp.UnitSystem() );
if ( !ON_IsValid(frustum_to_position_unit_scale)
|| !(frustum_to_position_unit_scale > 0.0)
)
return false;
// The values of frus_near and frus_far are adjusted later
// so the view's frustum contains the region in target_bbox.
double frus_near = pg_if.m_height*frustum_to_position_unit_scale;
if ( !ON_IsValid(frus_near) || !(frus_near > 0.0) )
return false;
double frus_far = 128.0*frus_near;
double frus_left, frus_right;
double frus_bottom, frus_top;
frus_left = frus_right = pg_if.m_corners[0].x;
frus_bottom = frus_top = pg_if.m_corners[0].y;
for ( size_t i = 1; i < sizeof(pg_if.m_corners)/sizeof(pg_if.m_corners[0]); i++ )
{
if ( pg_if.m_corners[i].x < frus_left )
frus_left = pg_if.m_corners[i].x;
else if ( pg_if.m_corners[i].x > frus_right )
frus_right = pg_if.m_corners[i].x;
if ( pg_if.m_corners[i].y < frus_bottom )
frus_bottom = pg_if.m_corners[i].y;
else if ( pg_if.m_corners[i].y > frus_top )
frus_top = pg_if.m_corners[i].y;
}
frus_left *= frustum_to_position_unit_scale;
frus_right *= frustum_to_position_unit_scale;
frus_bottom *= frustum_to_position_unit_scale;
frus_top *= frustum_to_position_unit_scale;
bool rc = false;
ON_Viewport vp;
for(;;)
{
if ( !vp.SetProjection( ON::perspective_view ) )
break;
if ( !vp.SetCameraLocation( pg_cp.Location() ) )
break;
if ( !vp.SetCameraDirection( -camera_plane.zaxis ) )
break;
if ( !vp.SetCameraUp( camera_plane.yaxis ) )
break;
if ( !vp.SetFrustum(frus_left,frus_right,frus_bottom,frus_top,frus_near,frus_far) )
break;
if ( !vp.SetScreenPort(0,image_width_pixels,0,image_height_pixels) )
break;
double bbox_near = ON_UNSET_VALUE;
double bbox_far = ON_UNSET_VALUE;
if ( vp.GetBoundingBoxDepth(target_bbox,&bbox_near,&bbox_far,false) )
{
if ( frus_near > 0.0 && ON_IsValid(bbox_near) && frus_near < bbox_near )
{
double s = 1.0;
while ( 2.0*s*frus_near <= bbox_near )
s *= 2.0;
if ( s >= 2.0 )
{
frus_near *= s;
frus_left *= s;
frus_right *= s;
frus_bottom *= s;
frus_top *= s;
frus_far = 1.0625*frus_near;
}
}
if ( ON_IsValid(bbox_far) && frus_far < bbox_far )
{
frus_far = 1.0625*bbox_far;
const double max_frus_far = 67108864.0*frus_near; // 2^26 * frus_near
if ( !(frus_far <= max_frus_far) )
frus_far = max_frus_far;
}
if ( !vp.SetFrustum(frus_left,frus_right,frus_bottom,frus_top,frus_near,frus_far) )
break;
}
rc = vp.IsValid() ? true : false;
if ( rc )
viewport = vp;
break;
}
return rc;
}