//----------------------------------------
void ofCamera::setupPerspective(bool vFlip, float fov, float nearDist, float farDist, const ofVec2f & lensOffset){
float viewW = ofGetViewportWidth();
float viewH = ofGetViewportHeight();
float eyeX = viewW / 2;
float eyeY = viewH / 2;
float halfFov = PI * fov / 360;
float theTan = tanf(halfFov);
float dist = eyeY / theTan;
if(nearDist == 0) nearDist = dist / 10.0f;
if(farDist == 0) farDist = dist * 10.0f;
setFov(fov);
setNearClip(nearDist);
setFarClip(farDist);
setLensOffset(lensOffset);
setForceAspectRatio(false);
setPosition(eyeX,eyeY,dist);
lookAt(ofVec3f(eyeX,eyeY,0),ofVec3f(0,1,0));
if(vFlip){
setScale(1,-1,1);
}
}
//----------------------------------------
void ofCamera::setupPerspective(bool _vFlip, float fov, float nearDist, float farDist, const ofVec2f & lensOffset){
ofRectangle orientedViewport = ofGetNativeViewport();
float eyeX = orientedViewport.width / 2;
float eyeY = orientedViewport.height / 2;
float halfFov = PI * fov / 360;
float theTan = tanf(halfFov);
float dist = eyeY / theTan;
if(nearDist == 0) nearDist = dist / 10.0f;
if(farDist == 0) farDist = dist * 10.0f;
setFov(fov);
setNearClip(nearDist);
setFarClip(farDist);
setLensOffset(lensOffset);
setForceAspectRatio(false);
setPosition(eyeX,eyeY,dist);
lookAt(ofVec3f(eyeX,eyeY,0),ofVec3f(0,1,0));
vFlip = _vFlip;
}
//----------------------------------------
void ofCamera::setupOffAxisViewPortal(const ofVec3f & topLeft, const ofVec3f & bottomLeft, const ofVec3f & bottomRight){
ofVec3f bottomEdge = bottomRight - bottomLeft; // plane x axis
ofVec3f leftEdge = topLeft - bottomLeft; // plane y axis
ofVec3f bottomEdgeNorm = bottomEdge.getNormalized();
ofVec3f leftEdgeNorm = leftEdge.getNormalized();
ofVec3f bottomLeftToCam = this->getPosition() - bottomLeft;
ofVec3f cameraLookVector = leftEdgeNorm.getCrossed(bottomEdgeNorm);
ofVec3f cameraUpVector = bottomEdgeNorm.getCrossed(cameraLookVector);
lookAt(cameraLookVector + this->getPosition(), cameraUpVector);
//lensoffset
ofVec2f lensOffset;
lensOffset.x = -bottomLeftToCam.dot(bottomEdgeNorm) * 2.0f / bottomEdge.length() + 1.0f;
lensOffset.y = -bottomLeftToCam.dot(leftEdgeNorm) * 2.0f / leftEdge.length() + 1.0f;
setLensOffset(lensOffset);
setAspectRatio( bottomEdge.length() / leftEdge.length() );
float distanceAlongOpticalAxis = abs(bottomLeftToCam.dot(cameraLookVector));
setFov(2.0f * RAD_TO_DEG * atan( (leftEdge.length() / 2.0f) / distanceAlongOpticalAxis));
}
