/*===========================================================================*\
*
* Routine: RT_SetCamera()
*
* Comments: Sets the camera
*
\*===========================================================================*/
TQ3Status RT_SetCamera(TRTDrawContext * /*inContext*/,
TQ3Point3D *inCameraLocation,TQ3Point3D *inPointOfInterests,
TQ3Vector3D *inUpVector,double minfov,
double aspectRatioXToY)
{
Camera.pos.x = inCameraLocation->x;
Camera.pos.y = inCameraLocation->y;
Camera.pos.z = inCameraLocation->z;
Camera.up.x = inUpVector->x;
Camera.up.y = inUpVector->y;
Camera.up.z = inUpVector->z;
Camera.lookp.x = inPointOfInterests->x;
Camera.lookp.y = inPointOfInterests->y;
Camera.lookp.z = inPointOfInterests->z;
/*
* Calculate hfov and vfov
*/
if (aspectRatioXToY <= 1.0)
{
Camera.hfov = Q3Math_RadiansToDegrees(minfov);
Camera.vfov = Q3Math_RadiansToDegrees( atan( tan( minfov * 0.5 ) /
aspectRatioXToY ) * 2.0 );
}
else
{
Camera.vfov = Q3Math_RadiansToDegrees(minfov);
Camera.hfov = Q3Math_RadiansToDegrees( atan( tan( minfov * 0.5 ) *
aspectRatioXToY ) * 2.0 );
}
return kQ3Success;
}
void pvCamera_Fit(DocumentPtr theDocument)
{
TQ3Point3D from, to;
TQ3BoundingBox viewBBox;
float fieldOfView, hither, yon;
if (!theDocument)
return;
if (!theDocument->fModel)
return;
pvBBox_Get(theDocument, &viewBBox);
pvBBoxCenter(&viewBBox, &to);
{
TQ3Vector3D viewVector;
TQ3Vector3D normViewVector;
TQ3Vector3D eyeToFrontClip;
TQ3Vector3D eyeToBackClip;
TQ3Vector3D diagonalVector;
float viewDistance;
float maxDimension;
Q3Point3D_Subtract(&viewBBox.max,
&viewBBox.min,
&diagonalVector);
maxDimension = Q3Vector3D_Length(&diagonalVector);
if (maxDimension == 0.0F)
maxDimension = 1.0F;
maxDimension *= 8.0F / 7.0F;
from.x = to.x;
from.y = to.y;
from.z = to.z + (2 * maxDimension);
Q3Point3D_Subtract(&to, &from, &viewVector);
viewDistance = Q3Vector3D_Length(&viewVector);
Q3Vector3D_Normalize(&viewVector, &normViewVector);
maxDimension /= 2.0F;
Q3Vector3D_Scale(&normViewVector,
viewDistance - maxDimension,
&eyeToFrontClip);
Q3Vector3D_Scale(&normViewVector,
viewDistance + maxDimension,
&eyeToBackClip);
hither = Q3Vector3D_Length(&eyeToFrontClip);
yon = Q3Vector3D_Length(&eyeToBackClip);
fieldOfView = Q3Math_RadiansToDegrees(1.25 * ErMath_Atan(maxDimension/hither));
}
{
TQ3ViewAngleAspectCameraData data;
TQ3Vector3D up = { 0.0F, 1.0F, 0.0F };
data.cameraData.placement.cameraLocation = from;
data.cameraData.placement.pointOfInterest = to;
data.cameraData.placement.upVector = up;
data.cameraData.range.hither = hither;
data.cameraData.range.yon = yon;
data.cameraData.viewPort.origin.x = -1.0F;
data.cameraData.viewPort.origin.y = 1.0F;
data.cameraData.viewPort.width = 2.0F;
data.cameraData.viewPort.height = 2.0F;
data.fov = Q3Math_DegreesToRadians(fieldOfView);
{
float w = (float)(theDocument->fWidth);
float h = (float)(theDocument->fHeight);
data.aspectRatioXToY = w/h;
}
if (theDocument->fView)
{
TQ3CameraObject camera;
Q3View_GetCamera(theDocument->fView, &camera);
if (camera) {
Q3ViewAngleAspectCamera_SetData(camera, &data);
Q3Object_Dispose(camera);
}
else {
camera = Q3ViewAngleAspectCamera_New (&data);
if (camera) {
Q3View_SetCamera (theDocument->fView, camera);
Q3Object_Dispose(camera);
}
}
}
}
}