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Display comments:Topic: All you need to know about Irradiance Maps (almost)
posted by Michael Watkins
archived on 22.5.2003
Questions are raised all the time about irradiance map saving.
Here are the two main ones.
a: Difference between multiframe incremental and incremental add to current map.
b: How to create a camera flythrough animation with a saved irradiance map
A: If you read the help file the description of the two methods are almost exactly the same. The main difference is that everytime multiframe incremental creates a new map it will delete the previous map. However incremental add to current map will simply add the new samples to whatever map is currently in memory. I go into this further here
B: The basics of using incremental add for a camera flyby is this. You need your camera to take new samples asit follows it animated path so that you can fill in new irradiance map samples in the room. However there is no need to create new samples every frame. The difference between frame 1 and 2 probably isnt that different and you wont be adding that many new samples. This is all dependant on the speed of your camera move.
Step 1: Since we dont want to create new samples every frame, change the nth frame rate in the render settings to something like 10 or 15 depending on the speed of your camera. who knows it might be slow enough to have something like 20 there.
Step 2: Next. turn off your save image function. We are here to save an irradiance map, not an image.
Step 3: Lower your AA to adaptive -4 -4.
Your irradiance map settings are your own to choose.
Step4: In advanced irradiance map settings though choose incremental add to current and turn on the auto save and autoload feature.
Final Steps: When your irradiance map pass is finished, reset the nth frame to 1 and put your AA back to the way you want it. Make sure your now using "Load" for your irradiance map and that your desired saved map is in Use.
This is a great tip to reeeeally speed up your render however if your just using a camera pan or tilt with the camera not moving possition but just rotation.
Step 1: All you need is single frame mode both for max frame rate and for Vray advanced irradiance map settings.
Step 2: Multiply your image size by 4 for height and by 3 for width
Step 3: Use adaptive AA with -4 -4 settings again
Step 4: Use a Cubic Camera
Step 5: Save this irradiance map
Step 6: Load the map and reset your camera type
Step 7: enjoy an irradiance map thats a calculation of the entire room from that camera possition at any camera angle. Therefore you can pan and tilt the camera in your animation with this single irradiance map and you only had to render 1 frame.
Follow-ups
Instead of the -4 -4 AA trick, in later versions of VRay you can now turn off the rendering pass in the Global Switches rollout.
is NOT the official
is property ofFrom Wikipedia, the free encyclopedia
This article needs additional citations for . Please help
by . Unsourced material may be challenged and removed. (May 2014)
A GPS tracking unit is a device that uses the
to determine the precise location of a vehicle, person, or other asset to which it is attached and to record the position of the asset at regular intervals. The recorded location data can be stored within the tracking unit, or it may be transmitted to a central location data base, or internet-connected computer, using a
( or ), , or
embedded in the unit. This allows the asset's location to be displayed against a map backdrop either in real time or when analysing the track later, using GPS tracking software. Data tracking software is available for smartphones with GPS capability.
A GPS tracker essentially contains GPS module to receive the GPS signal and calculate the coordinates. For data loggers it contains large memory to store the coordinates, data pushers additionally contains the GSM/GPRS modem to transmit this information to a central computer either via SMS or via
in form of IP packets. The diagram depicts a hardware architecture of an advanced GPS tracker.
Usually, a GPS tracker will fall into one of these three categories, though most , being , can work in all these modes, depending on which
are installed:
Typical GPS logger
A GPS logger simply
the position of the device at regular intervals in its internal memory. Modern GPS loggers have either a
slot, or internal flash memory card and a
port. Some act as a . This allows
of the track log data for further analyzing in a computer. The tracklist or
list may be in , ,
or other format.
save the time a photo was taken. Provided the camera clock was reasonably accurate or used GPS as its time source, this time can be correlated with GPS log data, to provide an accurate location. This can be added to the
metadata in the picture file. Cameras with GPS receiver built in can directly produce such a .
cases, data loggers are used to keep track of a target vehicle. The PI need not follow the target so closely, and always has a backup source of data.
Data pusher is the most common type of GPS tracking unit, used for ,
Also known as a GPS beacon, this kind of device
(i.e. "sends") the position of the device as well as other information like
at regular intervals, to a determined , that can store and instantly analyze the data.
and a mobile phone sit side-by-side in the same box, powered by the same battery. At regular intervals, the phone sends a text message via SMS or GPRS, containing the data from the GPS receiver. Newer GPS-integrated
running GPS tracking software can turn the phone into a data pusher (or logger) as of 2009
applications are available for common
enabled phones, , , Windows Mobile, and Symbian.
Most 21st-century GPS trackers provide data "push" technology, enabling sophisticated GPS tracking in business environments, specifically organizations that employ a mobile workforce, such as a commercial fleet. Typical GPS tracking systems used in commercial
have two core parts: location hardware (or tracking device) and tracking software. This combination is often referred to as an
system. The tracking device is most often hardwire inst connected to the ,
switch, battery. It allows collection of extra data, which later gets transferred to the , where it is available for viewing, in most cases via a website accessed over the , where fleet activity can be viewed live or historically using digital maps and reports.
GPS tracking systems used in commercial fleets are often configured to transmit location and telemetry input data at a set update rate or when an event (door open/close, auxiliary equipment on/off,
border cross) triggers the unit to transmit data. Live GPS Tracking used in commercial fleets, generally refers to systems which update regularly at 1 minute, 2 minute or 5 minute intervals, whilst the ignition status is on. Some tracking systems combine timed updates with heading change triggered updates.
GPS tracking solutions are recently being used in mainstream commercial auto insurance these are sometimes called .
The applications of trackers of this kind include:
. An arrested suspect out on bail may have to wear a GPS tracker, usually an , as a bail condition. GPS tracking may also be ordered for persons subject to a .
Race control. In some sports, such as , participants are required to carry a tracker. In particular this allows race officials to know if the participants are cheating, taking unexpected shortcuts, and how far apart they are. This use was illustrated in the movie .
/. A tracker on a person or vehicle allows movements to be tracked. This application is used by .
These devices are also used by some parents to track their children.
GPS personal tracking devices are used in the care of the elderly and vulnerable. Devices allow users to call for assistance and optionally allow designated carers to locate the user's position, typically within 5 to 10 metres. Their use helps promote independent living and social inclusion for the elderly. Devices often incorporate either 1-way or 2-way voice communication. Some devices also allow the user to call several phone numbers using pre-programmed speed dial buttons. Trials using GPS personal tracking devices are also underway in several countries for use with early stage dementia.
pioneers have created their own personal web pages that show their position constantly, and in real time, on a map within their website. These usually use data push from a GPS enabled cell phone or a personal GPS tracker.
Sports: the movements of a rambler, cyclist, etc., can be tracked. Statistics such as instantaneous and average speed, and distance traveled, are logged.
Adventure sports: GPS tracking devices such as the
are available that allow the position of a person to be tracked. In particular this allows rescue personnel to locate the carrier. These devices allow the carrier to send messages, even when out of cellular telephone range[].
Monitoring employees. GPS-handled tracking devices with built-in cellphone are used to monitor employees by various companies, specially those engaged in field work.
Solar Powered. The advantage of some solar powered units is that they have much more power over their lifetime than battery powered units. This gives them the advantage to report their position and status much more often than battery units which need to conserve their energy to extend their life. Some wireless solar powered units, such as the
can report more than 20,000 times per year and work indefinitely on solar power eliminating the need to change batteries.
Animal control. When put on a wildlife animal (e.g. in a collar), it allows scientists to study its activities and migration patterns. Vaginal implant transmitters mark the location where pregnant females give birth.
may also be put on domestic animals, to locate them in case they get lost.
GPS data pullers are also known as GPS transponders. Contrary to data pushers, that send the position of the devices at regular intervals (), these devices are always-on and can be queried as often as required (). This technology is not in widespread use, but an example of this kind of device is a computer connected to the
and running .
These can often be used in the case where the location of the tracker will only need to be known occasionally e.g. placed in property that may be stolen, or that does not have constant source of energy to send data on a regular basis, like freights or containers.
Data Pullers are coming into more common usage in the form of devices containing a GPS receiver and a cell phone which, when sent a special
message reply to the message with their location.
In the US, the use of GPS trackers by government authorities is limited by the , so police, for example, usually require a
in most circumstances. While police have placed GPS trackers in vehicles without warrant, this usage was questioned in court in early 2009.
Use by private citizens is regulated in some states, such as California, where California Penal Code Section 637.7 states: (a) No person or entity in this state shall use an electronic tracking device to determine the location or movement of a person. (b) This section shall not apply when the registered owner, lesser, or lessee of a vehicle has consented to the use of the electronic tracking device with respect to that vehicle. (c) This section shall not apply to the lawful use of an electronic tracking device by a law enforcement agency. (d) As used in this section, "electronic tracking device" means any device attached to a vehicle or other movable thing that reveals its location or movement by transmission of electronic signals. (e) A violation of this section is a misdemeanor. (f) A violation of this section by a person, business, firm, company, association, partnership, or corporation licensed under Division 3 (commencing with Section 5000) of the Business and Professions Code shall constitute grounds for revocation of the license issued to that person, business, firm, company, association, partnership, or corporation, pursuant to the provisions that provide for the revocation of the license as set forth in Division 3 (commencing with Section 5000) of the Business and Professions Code.
Note that 637.7 pertains to all electronic tracking devices, and does not differentiate between those that rely on GPS technology or not. As the laws catch up with the times, it is plausible that all 50 states will eventually enact laws similar to those of California.[]
Other laws, like the
as well as state criminal
statutes (for example, the wiretapping statute of the , which is extremely restrictive) potentially cover the use of GPS tracking devices by private citizens without consent of the individual being so tracked. Privacy can also be a problem when people use the devices to track the activities of a loved one. GPS tracking devices have also been put on religious statues in order to track the whereabouts of the statue if stolen.
In 2009, debate ensued about a Georgia proposal to outlaw hidden GPS tracking, with an exception for
but not for . See Georgia HB 16 - Electr location of person without consent (2009).
The law in the UK has not specifically addressed the use of GPS Trackers but several laws may impact the use of this technology as a surveillance tool.
Data Protection Act 1998
It is quite clear if you combine client instructions (written or digitally transmitted) that identify a person and a vehicle and then you deploy a tracker, the information gathered by the tracker becomes personal data as defined by the Data Protection Act 1998. The document “What is personal data? – A quick reference guide” published by the
(ICO) makes clear data that identifies a living individual is personal data. If a living individual can be identified from the data, or from the data and other information in your possession, or likely to come into your possession, then it’s personal data.
Identifiability
An individual is identified if you have distinguished that individual from other members of a group. In most cases, an individual’s name together with some other information will be sufficient to identify them. Simply because you do not know the name of an individual does not mean you cannot identify that individual. Start by looking at the means available to identify an individual and the extent to which such means are readily available to you.
Does the data ‘relate to’ the identifiable living individual, whether in personal or family life, business or profession?
Relates to' means: Data which identifies an individual, even without an associated name, may be personal data which is processed to learn or record something about that individual, or the processing of information that has an impact on the individual. Therefore, data may ‘relate to’ an individual in several different ways.
Is the data ‘obviously about’ a particular individual?
Data ‘obviously about’ an individual will include his medical history, criminal record, record of his work, or his achievements in a sporting activity. Data that is not ‘obviously about’ a particular individual may include information about his activities. Data such as personal bank statements or itemized telephone bills will be personal data about the individual operating the account or contracting for telephone services. Where data is not ‘obviously about’ an identifiable individual it may be helpful to consider whether the data is being processed, or could easily be processed, to learn, record or decide something about an identifiable individual. Information may be personal data where the aim, or an incidental consequence, of the processing, is that you learn or record something about an identifiable individual, or the processing could have an impact on, or affect, an identifiable individual. Data from a Tracker would be to identify the individual or his activities. It is therefore personal data within the meaning of the Data Protection Act 1998.
Any individual who wishes to gather personal data must be registered with the
(ICO) and have a DPA number. It is a criminal offence to process data and not have a DPA number.
It may be a civil trespass to deploy a tracker onto a car not belonging to your client or to yourself. But in the OSC’s annual inspection, the OSC’s Chief Surveillance Commissioner
stated “putting an arm into a wheel arch or under the frame of a vehicle is straining the concept of trespass“.
However, entering private land of anyone in order to deploy a tracker is clearly a trespass which is a civil tort.
Prevention of Harassment Act 1997
At times, the public misinterprets surveillance, in all its forms, as stalking. Whilst there is no strict legal definition of 'stalking', neither is there specific legislation to address this behaviour. Rather, it is a term used to describe a particular kind of harassment. Generally, it is used to describe a long-term pattern of persistent and repeated contact with, or attempts to contact, a particular victim.
The Protection of Freedoms Act 2012 created two new offences of stalking by inserting new sections 2A and 4A into the PHA 1997. The new offences which came into force on 25 November 2012, are not retrospective. Section 2A (3) of the PHA 1997 sets out examples of acts or omissions which, in particular circumstances, are ones associated with stalking. Examples are: following a person, watching or spying on them, or forcing contact with the victim through any means, including social media.
Such behaviour curtails a victim's freedom, leaving them feeling that they constantly have to be careful. In many cases, the conduct might appear innocent (if considered in isolation), but when carried out repeatedly, so as to amount to a course of conduct, it may then cause significant alarm, harassment or distress to the victim.
It should be noted that the examples given in section 2A (3) is not an exhaustive list but an indication of the types of behaviour that may be displayed in a stalking offence.
Stalking and harassment of another or others can include a range of offences such as those under: the Protection from Harassment Act 1997; the Offences Against the Person Act 1861; the Sexual Offences Act 2003; and the Malicious Communications Act 1988.
Examples of the types of conduct often associated with stalking include:
indirect contact through friends, work colleagues,
or, other intrusions into the victim’s privacy. The behaviour curtails a victim’s freedom, leaving them feeling that they constantly have to be careful.
If the subject of enquiry is aware of the tracking, then this may amount to harassment under the Prevention of Harassment Act 1997. There is a case at the Royal Courts of Justice where a private investigator is being sued under this act for the use of trackers. In December 2011, a Claim was brought against Richmond Day & Wilson Limited (First Defendant) and Bernard Matthews Limited (Second Defendant), Britain’s leading Turkey Provider.
The case relates to the discovery of a tracking device found in August 2011 on a vehicle supposedly connected to Hillside Animal Sanctuary.
Regulation of Investigatory Powers Act 2000
Property Interference: The Home Office published a document entitled “Covert Surveillance and Property Interference, Revised Code of Practice, Pursuant to section 71 of the Regulation of Investigatory Powers Act 2000”
where it suggests in Chapter 7, page 61
General basis for lawful activity
7. 1 Authorisations under section 5 of the 1994 Act or Part III of the 1997 Act should be sought wherever members of the intelligence services, the police, the services police, Serious and Organised Crime Agency (SOCA), Scottish Crime and Drug Enforcement Agency (SCDEA), HM Revenue and Customs (HMRC) or Office of Fair Trading (OFT), or persons acting on their behalf, conduct entry on, or interference with, property or with wireless telegraphy that would be otherwise unlawful.
7. 2 For the purposes of this chapter, “property interference” shall be taken to include entry on, or interference with, property or with wireless telegraphy.
Example: The use of a surveillance device for providing information about the location of a vehicle may involve some physical interference with that vehicle as well as subsequent directed surveillance activity. Such an operation could be authorised by a combined authorisation for property interference (under Part III of the 1997 Act) and, where appropriate, directed surveillance (under the 2000 Act). In this case, the necessity and proportionality of the property interference element of the authorisation would need to be considered by the appropriate authorising officer separately to the necessity and proportionality of obtaining private information by means of the directed surveillance.
This can be interpreted to mean that placing a tracker on a vehicle without the consent of the owner is illegal unless you obtain authorisation from the Surveillance Commissionaire under the RIPA 2000 laws. Since a member of the public cannot obtain such authorisations, it is therefore illegal property interference.
Another interpretation is that it is illegal to do so IF you are acting under the instruction of a public authority and you do not obtain authorisation. The legislation makes no mention of property interference for anyone else.
The second interpretation appears to be the valid one. Currently there is no legislation in place that deals with the deployment of trackers in a criminal sense except RIPA 2000 and that RIPA 2000 ONLY applies to those agencies and persons mentioned in it.
In August, 2010, Brazilian company Unilever ran a promotion where GPS trackers were placed in boxes of Omo laundry detergent. Teams would then track consumers who purchased the boxes of detergent to their homes where they would be awarded with a prize for their purchase. The company also launched a website (in Portuguese) to show the approximate location of the winners' homes.
. Axivo Inc. 7 September .
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Tovia Smith (August 29, 2006). . .
Claburn, Thomas (March 4, 2009). . InformationWeek.
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Koch, Wendy (). . USA Today.
Bello, Marisol (). . USA Today.
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Wentz, Laurel (). . Advertising Age.
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