void Camera::applyViewingTransform() {
if( mDirtyTransform )
calculateViewingTransformParameters();
// Place the camera at mPosition, aim the camera at
// mLookAt, and twist the camera such that mUpVector is up
/*
gluLookAt( mPosition[0], mPosition[1], mPosition[2],
mLookAt[0], mLookAt[1], mLookAt[2],
mUpVector[0], mUpVector[1], mUpVector[2]);
*/
lookAt( Vec3f(mPosition[0], mPosition[1], mPosition[2]),
Vec3f(mLookAt[0], mLookAt[1], mLookAt[2]),
Vec3f(mUpVector[0], mUpVector[1], mUpVector[2]));
}
void ModelerCamera::dragMouse( int x, int y )
{
Vec3f mouseDelta = Vec3f(x,y,0.0f) - mLastMousePosition;
mLastMousePosition = Vec3f(x,y,0.0f);
switch(mCurrentMouseAction)
{
case kActionTranslate:
{
calculateViewingTransformParameters();
double xTrack = -mouseDelta[0] * kMouseTranslationXSensitivity;
double yTrack = mouseDelta[1] * kMouseTranslationYSensitivity;
Vec3f transXAxis = mUpVector ^ (mPosition - mLookAt);
transXAxis /= sqrt((transXAxis*transXAxis));
Vec3f transYAxis = (mPosition - mLookAt) ^ transXAxis;
transYAxis /= sqrt((transYAxis*transYAxis));
setLookAt(getLookAt() + transXAxis*xTrack + transYAxis*yTrack);
break;
}
case kActionRotate:
{
float dAzimuth = -mouseDelta[0] * kMouseRotationSensitivity;
float dElevation = mouseDelta[1] * kMouseRotationSensitivity;
setAzimuth(getAzimuth() + dAzimuth);
setElevation(getElevation() + dElevation);
break;
}
case kActionZoom:
{
float dDolly = -mouseDelta[1] * kMouseZoomSensitivity;
setDolly(getDolly() + dDolly);
break;
}
case kActionTwist:
// Not implemented
default:
break;
}
}
Camera::Camera()
{
mAzimuth = mTwist = 0.0f;
mElevation = 0.7f;
mDolly = -20.0f;
mLookAt = Vec3f( 0, 0, 0 );
mCurrentMouseAction = kActionNone;
m_bSnapped = false;
for (int i=AZIMUTH; i<NUM_KEY_CURVES; i++)
mKeyframes[i] = NULL;
calculateViewingTransformParameters();
mNumKeyframes = 0;
}
void Camera::applyViewingTransform() {
if( mDirtyTransform )
calculateViewingTransformParameters();
ModelerDrawState *mds = ModelerDrawState::Instance();
if(mds->m_rayFile)
{
fprintf( mds->m_rayFile, "camera {\n\tposition = (%f, %f, %f);\n\tlook_at = (%f, %f, %f);\n\taspectratio = 1\n\tfov = 30; }\n\n",
mPosition[0], mPosition[1], mPosition[2],
mLookAt[0], mLookAt[1], mLookAt[2]);
}
// Place the camera at mPosition, aim the camera at
// mLookAt, and twist the camera such that mUpVector is up
/*gluLookAt( mPosition[0], mPosition[1], mPosition[2],
mLookAt[0], mLookAt[1], mLookAt[2],
mUpVector[0], mUpVector[1], mUpVector[2]);*/
// You Will Have to implement this (gluLookAt() ) yourself!
// what fun that will be!
Vec3f n = mPosition - mLookAt;
Vec3f v = mUpVector - ((mUpVector * n) / (n * n)) * n;
Vec3f u = v ^ n;
u.normalize();
v.normalize();
n.normalize();
Mat4f mat;
mat[0][0] = u[0]; mat[0][1] = v[0]; mat[0][2] = n[0];
mat[1][0] = u[1]; mat[1][1] = v[1]; mat[1][2] = n[1];
mat[2][0] = u[2]; mat[2][1] = v[2]; mat[2][2] = n[2];
mat = mat.transpose();
mat = mat * mat.createTranslation(-mPosition[0], -mPosition[1], -mPosition[2]);
// Transpose the final matrix so that n is in column-major order to match OpenGL.
mat = mat.transpose();
glMultMatrixf(mat.n);
}
