20 Best 3d Led Home Theater Projector [2024]

Are you looking for the best 3d Led Home Theater Projector? Based on expert reviews, we ranked them. We've listed our top-ranked picks, including the top-selling 3d Led Home Theater Projector.

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# Preview Product
1 HD 1080P LED Portable Mini Projector Home Theater Projectors Video Multimedia 3D Projector HD 1080P LED Portable Mini Projector Home Theater Projectors Video Multimedia 3D Projector
2 Android Smart Projector V5 WiFi Home Theater LED Portable 3D DLP-Link Video Projector Support Full... Android Smart Projector V5 WiFi Home Theater LED Portable 3D DLP-Link Video Projector Support...
3 Optoma HD39HDR High Brightness HDR Home Theater Projector | 120Hz Refresh Rate | 4000 lumens | Fast... Optoma HD39HDR High Brightness HDR Home Theater Projector | 120Hz Refresh Rate | 4000 lumens |...
4 ViewSonic (X10-4KE) 4K UHD Projector with 2400 LED Lumens, Shorter Throw, Harman Kardon Speakers,... ViewSonic (X10-4KE) 4K UHD Projector with 2400 LED Lumens, Shorter Throw, Harman Kardon Speakers,...
5 BenQ DLP HD 1080p Projector (W1070) - 3D Home Theater Projector with Lens Shift Technology and... BenQ DLP HD 1080p Projector (W1070) - 3D Home Theater Projector with Lens Shift Technology and...
6 Pocket DLP Mini Projector 3D WiFi Full HD 1080P Supported Outdoor Movie Cinema Wireless Airplay Home... Pocket DLP Mini Projector 3D WiFi Full HD 1080P Supported Outdoor Movie Cinema Wireless Airplay...
7 Fosa Mini Projector Portable 1080P LED Projector Home Cinema Theater Indoor/Outdoor Movie projectors... Fosa Mini Projector Portable 1080P LED Projector Home Cinema Theater Indoor/Outdoor Movie...
8 LED Mini Projector Home Theater Projectors Portable Full HD 3D Projector 7000 lumens TFT LCD... LED Mini Projector Home Theater Projectors Portable Full HD 3D Projector 7000 lumens TFT LCD...
9 Optoma HD26 1080p 3D DLP Home Theater Projector Optoma HD26 1080p 3D DLP Home Theater Projector
10 AuKing Mini Projector 2022 Upgraded Portable Video-Projector,55000 Hours Multimedia Home Theater... AuKing Mini Projector 2022 Upgraded Portable Video-Projector,55000 Hours Multimedia Home Theater...
11 GRC Mini Projector, 1080P HD Supported Portable Movie Projector with 45000 Hrs LED Lamp Life,... GRC Mini Projector, 1080P HD Supported Portable Movie Projector with 45000 Hrs LED Lamp Life,...
12 Moon Lamp, LOGROTATE 16 Colors LED Night Light 3D Printing Moon Light with Stand & Remote/Touch... Moon Lamp, LOGROTATE 16 Colors LED Night Light 3D Printing Moon Light with Stand & Remote/Touch...
13 Mini Projector,HOMPOW Portable Projector 1080P Supported 2022 Upgraded Movie Projector and 176'... Mini Projector,HOMPOW Portable Projector 1080P Supported 2022 Upgraded Movie Projector and 176"...
14 Optoma HD28HDR 1080p Home Theater Projector for Gaming and Movies | Support for 4K Input | HDR... Optoma HD28HDR 1080p Home Theater Projector for Gaming and Movies | Support for 4K Input | HDR...
15 YABER Y31 9500L Native 1920x 1080P Projector, 2022 Upgraded Full HD Video Projector, ±50° 4D... YABER Y31 9500L Native 1920x 1080P Projector, 2022 Upgraded Full HD Video Projector, ±50° 4D...
16 YABER Y30 Native 1080P Projector 9500L Brightness Full HD Video Projector 1920 x 1080, ±50° 4D... YABER Y30 Native 1080P Projector 9500L Brightness Full HD Video Projector 1920 x 1080, ±50° 4D...
17 LitEnergy LED Sky Projector Light, Galaxy Lighting, Nebula Star Night Lamp with Base and Remote... LitEnergy LED Sky Projector Light, Galaxy Lighting, Nebula Star Night Lamp with Base and Remote...
18 AAXA 4K1 LED Home Theater Projector, 30,000 Hour LEDs, Mercury Free, Native 4K UHD Resolution, Dual... AAXA 4K1 LED Home Theater Projector, 30,000 Hour LEDs, Mercury Free, Native 4K UHD Resolution,...
19 Native 1080P Projector 5G WiFi and Bluetooth, FANGOR 350 ANSI Outdoor Projector 4K Support, Home... Native 1080P Projector 5G WiFi and Bluetooth, FANGOR 350 ANSI Outdoor Projector 4K Support, Home...
20 4K Projector, WiMiUS P28 WiFi LED Projector Native 1920x1080 Outdoor Projector 10000:1 Contrast... 4K Projector, WiMiUS P28 WiFi LED Projector Native 1920x1080 Outdoor Projector 10000:1 Contrast...
Bestseller No. 1
HD 1080P LED Portable Mini Projector Home Theater Projectors Video Multimedia 3D Projector
  • Optical resolding: 1280x720dpi
  • Light source: LED
  • Projection distance: 2-4m (30-120inches)
  • Brightness: 3500LM
  • Projector dimension: 250mm x 170mm x 80mm
Bestseller No. 2
Android Smart Projector V5 WiFi Home Theater LED Portable 3D DLP-Link Video Projector Support Full...
  • 【2019 NEW RELEASE Smart Video Projector V5】300 inch Android Smart 3D Projector Support 4K (at HDMI mode only). Wireless Connection for iphone ipad...
  • 【ANDROID SMART OS】Support download and install APPs, watch movies online, play games. Online firmware update.
  • 【HIGHER BRIGHTESS & RESOLUTION】Native Resolution: 1280*800 (WVGA) ,Max support 4K via HDMI. Support 3D function(DLP-LINK). LED bulb life: 30000...
  • 【WIRED or WIRELESS】2.4G & 5G Dual-band WiFi. Bluetooth 4.0 for wireless speakers or other devices. Ethernet port x1, HDMI 2.0 (Max support 4K) x1,...
  • 【PACKAGE INCLUDES】3D DLP smart projector x1, FREE 3D glasses x1, Power adapter x1, Power cord x1, Infrared remote control x1, User Manual. 1 Year...
SaleBestseller No. 3
Optoma HD39HDR High Brightness HDR Home Theater Projector | 120Hz Refresh Rate | 4000 lumens | Fast...
  • HDR COMPATIBLE: HDR10 technology (with 4K input) enables brigher whites and deeper black levels for an enhanced viewing experience
  • FAST RESPONSE TIME: Enhanced Gaming Mode enables lightning-fast response time of 8.4ms with a 120Hz refresh rate
  • HIGH BRIGHT & COLORFUL IMAGE: Enjoy an incredible 4,000 lumens of brightness for lights-on viewing; a 6-segment color wheel (RYGCWB) produces accurate...
  • CLEAR, DETAILED IMAGES: 1080p (1920×1080) resolution (with 4K input) and 50,000:1 contrast ratio renders sharp and detailed images from high...
  • EXTENSIVE CONNECTIVITY: Connect to gaming consoles, media players and other HDMI devices such as Google Chromecast, Amazon Fire Stick and Apple TV;...
Bestseller No. 4
ViewSonic (X10-4KE) 4K UHD Projector with 2400 LED Lumens, Shorter Throw, Harman Kardon Speakers,...
  • BIG SCREEN HOME THEATER: Immersive theater-like experience in 4K UHD (3840x2160), on a screen up to 200 inches in 2400 (LED) lumens
  • LAMP-FREE PROJECTION: Solid-state LED technology with 30,000-hour lifespan consumes far less power than a typical LCD TV
  • VIVID COLORS: Rec. 709 color accuracy and HDR content support produces lifelike colors for a fuller, more immersive viewing experience
  • PREMIUM AUDIO: Built-in Dual Harman Kardon Bluetooth speakers deliver room-filling audio
  • PORTABLE DESIGN: An easy carry handle and short throw lens allows for big-screen projection in any room, indoors or out
Bestseller No. 5
BenQ DLP HD 1080p Projector (W1070) - 3D Home Theater Projector with Lens Shift Technology and...
  • Full HD 3D 1080p image projection up to 200 inches. A 10,000:1 contrast ratio and 2,000 ANSI lumens of brightness
  • Includes SmartEco technology for energy conservation and auto standby mode to save energy and prolong lamp life; lasts up to 6,000 hours
  • Watch Full HD 1080p movies, TV shows and sports, or play action packed video games on screens up to 200 inches in diagonal in any room of the house
  • Built-in speakers are plug-and-play ready, only the power cord and video source connection are needed to prepare the viewing experience
Bestseller No. 6
Pocket DLP Mini Projector 3D WiFi Full HD 1080P Supported Outdoor Movie Cinema Wireless Airplay Home...
  • 【Portable Projector for Anywhere】DLP projector is famous for its smaller size, only 3.9x4.3x1.5 inches and 0.66 pounds, you can put it in your...
  • 【Wireless Connection & Auto Adjustment】The pocket projector has WiFi mirroring function, which can directly sync the screen of your...
  • 【Big Screen 3D Cinema】Our mini DLP projector has an unique 3D playback function, which supports side-by-side/top-bottom active shutter 3D video....
  • 【Play High-quality Images/Sounds】Due to the reflection principle, DLP projectors can achieve clearer and more stable projection. There will be no...
  • 【More Wired Connections】Portable projector is equipped with multiple ports (USB/HDMI/3.5mm audio jack), powerfully compatible with almost most...
Bestseller No. 7
Fosa Mini Projector Portable 1080P LED Projector Home Cinema Theater Indoor/Outdoor Movie projectors...
  • Mini Projector: 4.7*3.4*1.9in mini Size and weight just 595g also with Pretty cute appearance make it very compact and portable. It's very easy to...
  • HD Multi interface Projector: 320*240; 400 600 lumen With LED light source; Contrast: 800:1; Multimedia support format: Audio file: MP3 ,WMA ,OGG ,AAG...
  • Support Wall mounted Charger: This is a mini projector without built in battery , so if you are camping or hiking , you need to use the wall mounted...
Bestseller No. 8
LED Mini Projector Home Theater Projectors Portable Full HD 3D Projector 7000 lumens TFT LCD...
  • Contrast: 800:1
  • Brightness: 7000 lumens
  • Imaging Technology: TFT LCD
  • Native Resolution: 320*240 pixels
  • Support Resolution: 1920*1080 pixels
Bestseller No. 9
Optoma HD26 1080p 3D DLP Home Theater Projector
  • Screen Size Range: 71-inches from 8 feet; 107-inches from 12 feet
  • Brightness: 3200 ANSI Lumens
  • Contrast Ratio: 25,000:1; Keystone Correction: Yes, Lens Shift: No
  • Warranty: 1-Year Limited Parts and Labor, 90-Days on Lamp
  • Inputs: 2 x HDMI (1.4a 3D support) plus MHL, Audio Out 3.5mm, 12V trigger, 3D-Sync, USB service
SaleBestseller No. 10
AuKing Mini Projector 2022 Upgraded Portable Video-Projector,55000 Hours Multimedia Home Theater...
  • ★【Superior Home Theater Projector 】2022 Upgraded mini projector equipped with 2000:1 contrast ratio, supported 1080p resolution, brings you a...
  • ★【Big Screen & Built-in Speakers】The mini projector has a 32~170 inches projection display size with 1m to 5m projection distance. Built-in...
  • ★【Low Noise & Long Lamp Life】The projector is lower in noise and more durable than previous models thanks to advanced fan cooling technology....
  • ★【Multiple Devices Connection & Portable】This portable movie projector is fit for playing videos, TV series, photos sharing, football matches...
  • ★【2 Year Satisfied Warranty】Our team offers every customer 100% satisfaction guarantee. If you have any problems while using, please feel free...
SaleBestseller No. 11
GRC Mini Projector, 1080P HD Supported Portable Movie Projector with 45000 Hrs LED Lamp Life,...
  • 1080P High Definition Performance: This Mini Projector Equipped With 3000:1 Contrast Ratio, Supported 1080P Resolution. It Can Play Ultra-Clear Movies...
  • Multi-Interface Compatibility: It Includes Hdmi/Usb/Tf/Av/Vga Interfaces. Whether It Is A Computer, Game Host, Smartphones, Tv Or Dvd Player, It Can...
  • High-Quality Audio-Visual Experience: Built-In Dual High-Fidelity Speaker, Perfect For Outdoor Projection. The Trapezoidal Correction Of Positive And...
  • Unmatched Stability: Stable Performance Brings Excellent Quality:The Lamp Life Of Up To 45000 Hours S That The Projector Can Be Used For 30 Years (4...
Bestseller No. 12
Moon Lamp, LOGROTATE 16 Colors LED Night Light 3D Printing Moon Light with Stand & Remote/Touch...
  • Moon lamp with the diameter is 4.8 INCH, made with 3D printing technology, realistic full moon shape, the surface of the moon lamp is very close to...
  • Night Light with 16 color RGB, and the 16 colors can flash or fade or strobe, dreamlike and creative decorative lights, perfect decorative lights or...
  • Moon light with remote & touch control model. And the REMOTE CONTROL DISTANCE CAN REACH TO 30 FEET. Use the remote control to change the color or also...
  • Moon lamp with the build-in rechargeable battery, can charge on your computer / power bank or charge adaptor etc. No line hanging around, you can hold...
  • What You Get : 24-hour professional service center and 24/7/365 technical support. Just try it!
SaleBestseller No. 13
Mini Projector,HOMPOW Portable Projector 1080P Supported 2022 Upgraded Movie Projector and 176"...
  • Projector Mini and support 1080P HD:♥This phone projector support 1920x1080P high resolution which give you and your family an amazing feeling,...
  • Support multiple multimedia device:♥This mini home projector has a mini SD card slot,composite video in, vga, HDMI, and 2 USB ports. Here is a tip,...
  • Big screen & built-in speakers: ♥It is a really decent movie projector for indoor use,The recommended projection distance is 60-200 inches, you will...
  • Low noise:♥The portable movie projector is lower in noise and more durable than previous models thanks to advanced fan cooling technology. Add to...
  • Easy to use and 2 years warranty: ♥The bottom of the movie projector where the height/tilt adjuster is can be used to mount the projector onto a...
Bestseller No. 14
Optoma HD28HDR 1080p Home Theater Projector for Gaming and Movies | Support for 4K Input | HDR...
  • NEXT GENERATION TECHNOLOGY: Enjoy clear detailed 1080p (1920×1080) images (with 4K input) and 50,000:1 contrast ratio renders sharp and detailed...
  • HDR COMPATIBLE: HDR10 technology (with 4K input) enables brigher whites and deeper black levels for an enhanced viewing experience
  • HIGH BRIGHT & COLORFUL IMAGE: Enjoy an incredible 3,600 lumens of brightness for lights-on viewing; a 6-segment color wheel (RYGCWB) produces accurate...
  • FAST RESPONSE TIME: Enhanced Gaming Mode enables lightning-fast response time of 16ms with a 120Hz refresh rate; Game Display Mode boosts shadows and...
  • MORE IMAGE DEPTH: Dynamic Black technology provides more depth to the image by smoothing lamp output to create high contrast; bright scenes appear...
SaleBestseller No. 15
YABER Y31 9500L Native 1920x 1080P Projector, 2022 Upgraded Full HD Video Projector, ±50° 4D...
  • 🌻 [Innovative One-Click to Brighten & 4D Keystone Correction Function] Official Feature Sponsor of New Orleans Film Festival-Our Y31 hd projector...
  • 💜 [1080P Native Resolution (1920*1080), Support Play 4k Video] The projector with native 1920*1080 resolution, remarkable 9000L Brightness and high...
  • 💙 [HIFI Stereo Sound & Latest Advanced Cooling System] The LED projector has built-in 3W dual stereo speakers with SRS sound system provides a...
  • 💚 [300" Giant Screen & Wide Compatibility ] The video projector offers the projection size from 50" to 300" depending on the distance and 10ft is...
  • 💞 [Three-year & Lifetime Professional Support] This 1080P projector is very suitable for home movie entertainment, backyard, games and party fun....
Bestseller No. 16
YABER Y30 Native 1080P Projector 9500L Brightness Full HD Video Projector 1920 x 1080, ±50° 4D...
  • ❤[Innovative 4D Keystone Correction & Zoom Function] Our HD projector is the first projector with± 50 ° 4D (vertical & horizontal) keystone...
  • ❤[1080P Native Resolution (1920*1080), Support 4K Video] The projector with a real native resolution of 1920*1080, remarkable 9500L bright and high...
  • ❤[Hifi Stereo Sound & Latest Advanced Cooling System] The Y30 LED projector has built-in 3W dual stereo speakers with SRS sound system provides a...
  • ❤[Giant Screen & Wide Compatibility] The video projector offers the projection size from 45" to 300" depending on the distance (1.5 - 5.5 meters)...
  • ❤[Three-Year & Lifetime Professional Support] This 1080P projector is very suitable for home movie entertainment, backyard, games and party fun....
SaleBestseller No. 17
LitEnergy LED Sky Projector Light, Galaxy Lighting, Nebula Star Night Lamp with Base and Remote...
  • [Star, Cloud & Full Moon Mode in One Projector ]- LITENERGY LED star night light projector projects amazing nebula, stars & a full moon (behind a...
  • [Rechargeable & Portable] - The galaxy projector is powered by battery and comes with a USB cord, which means you can bring it anywhere or place it...
  • [EASY TO USE] - It is equipped with a remote control that allows you to operate from anywhere in the room, saving you having to get up out of your...
  • [7 Colors Night Light & 9 Lighting Modes] - Features 7 different colors, including red, green, blue, yellow, cyan, purple and mixing of colors for...
  • [Perfect Gift For Family & Children] - The galaxy light projector is suitable for birthday, party, Wedding, Room decor, children's day, Christmas,...
Bestseller No. 18
AAXA 4K1 LED Home Theater Projector, 30,000 Hour LEDs, Mercury Free, Native 4K UHD Resolution, Dual...
  • Native 4K UHD (3840x2160) Ultra High Definition Pixel Resolution, 1500 LED Lumen Brightness powered by 30,000+ Hours Osram Quad-Cast LEDs
  • Dual HDMI 2.0 with HDCP 2.2 Inputs allows user to stream 4K UHD content. Compatible with Netflix, Hulu, Prime Video 4K UHD content (4K Streaming TV...
  • Remote Electric Focus offers better control over adjustments to ensure a crisp projection. Premium Dual 2W Speakers delivers room-filling sound for an...
  • Portable Design and Operation - Play Videos, Image, Music and Text directly from a USB or TF Card with the Onboard Media Player. Portable size, easy...
  • Perfect for Home Theater, Business Use. Up to 200" screen (in low light conditions). Ceiling Mount compatible (Mount Kit sold separately).
Bestseller No. 19
Native 1080P Projector 5G WiFi and Bluetooth, FANGOR 350 ANSI Outdoor Projector 4K Support, Home...
  • 【1080P Full HD Projector】FANGOR F405 original resolution is 1920*1080, the full hd projector supports to play 4K video. the projection size from...
  • 【2.4G/5G WiFi & Bluetooth 5.0】 This 5G WiFi projector supports 2.4G/5G WiFi dual-band connection, you can easily to wireless connect your...
  • 【Dual Stereo Sound & Cooling System】 This video projector build-in 5W dual stereo speakers offer a high sound effects quality which enables you to...
  • 【Suitable For Various Occasions】 The numerous interfaces, including HDMI, VGA, AV, USB and Micro SD interfaces ensures a wide range of...
  • 【90 Days Refund & 3 Years Warranty】 The FANGOR Projector offers up to 90 days of unconditional refund service and 3 years of professional...
Bestseller No. 20
4K Projector, WiMiUS P28 WiFi LED Projector Native 1920x1080 Outdoor Projector 10000:1 Contrast...
  • FULL HD 4K PROJECTOR AND ONE-KEY BRIGHTEN FUNCTION: We adopted brand new Optical Machine, which greatly improved the brightness of the projector by...
  • TRUE NATIVE 1080P PROJECVTOR AND 10000:1 CONTRAST RATIO: This TV projector with real native resolution 1920*1080 ( 80% other brand only support...
  • DUAL 10W HIFI SPEAKER AND ±50°KEYSTONE CORRECTION: It has dual internal 10W Hi-Fi speakers, which will produce stereo , clear and loud sound. No...
  • WIFI MIRRORRING AND OTHER ADVANTAGES: 50-400 inches projection size. 100% to 75% zoom out function. Multiple connection: PC, DVD player, PS4, Fire TV...
  • 100,000 HOURS LED LAMP AND LEADING SERVICE: Are you worrying about the projector stop working after one year? Are you waiting for the response from...

Having trouble finding a great 3d Led Home Theater Projector?

This problem is well understood by us because we have gone through the entire 3d Led Home Theater Projector research process ourselves, which is why we have put together a comprehensive list of the best 3d Led Home Theater Projectors available in the market today.

After hours of searching and using all the models on the market, we have found the best 3d Led Home Theater Projector for 2023. See our ranking below!

How Do You Buy The Best 3d Led Home Theater Projector?

Do you get stressed out thinking about shopping for a great 3d Led Home Theater Projector? Do doubts keep creeping into your mind?

We understand, because we’ve already gone through the whole process of researching 3d Led Home Theater Projector, which is why we have assembled a comprehensive list of the greatest 3d Led Home Theater Projector available in the current market. We’ve also come up with a list of questions that you probably have yourself.

John Harvards has done the best we can with our thoughts and recommendations, but it’s still crucial that you do thorough research on your own for 3d Led Home Theater Projector that you consider buying. Your questions might include the following:

  • Is it worth buying an 3d Led Home Theater Projector?
  • What benefits are there with buying an 3d Led Home Theater Projector?
  • What factors deserve consideration when shopping for an effective 3d Led Home Theater Projector?
  • Why is it crucial to invest in any 3d Led Home Theater Projector, much less the best one?
  • Which 3d Led Home Theater Projector are good in the current market?
  • Where can you find information like this about 3d Led Home Theater Projector?

We’re convinced that you likely have far more questions than just these regarding 3d Led Home Theater Projector, and the only real way to satisfy your need for knowledge is to get information from as many reputable online sources as you possibly can.

Potential sources can include buying guides for 3d Led Home Theater Projector, rating websites, word-of-mouth testimonials, online forums, and product reviews. Thorough and mindful research is crucial to making sure you get your hands on the best-possible 3d Led Home Theater Projector. Make sure that you are only using trustworthy and credible websites and sources.

John Harvards provides an 3d Led Home Theater Projector buying guide, and the information is totally objective and authentic. We employ both AI and big data in proofreading the collected information.

How did we create this buying guide? We did it using a custom-created selection of algorithms that lets us manifest a top-10 list of the best available 3d Led Home Theater Projector currently available on the market.

This technology we use to assemble our list depends on a variety of factors, including but not limited to the following:

  1. Brand Value: Every brand of 3d Led Home Theater Projector has a value all its own. Most brands offer some sort of unique selling proposition that’s supposed to bring something different to the table than their competitors.
  2. Features: What bells and whistles matter for an 3d Led Home Theater Projector?
  3. Specifications: How powerful they are can be measured.
  4. Product Value: This simply is how much bang for the buck you get from your 3d Led Home Theater Projector.
  5. Customer Ratings: Number ratings grade 3d Led Home Theater Projector objectively.
  6. Customer Reviews: Closely related to ratings, these paragraphs give you first-hand and detailed information from real-world users about their 3d Led Home Theater Projector.
  7. Product Quality: You don’t always get what you pay for with an 3d Led Home Theater Projector, sometimes less, and sometimes more.
  8. Product Reliability: How sturdy and durable an 3d Led Home Theater Projector is should be an indication of how long it will work out for you.

John Harvards always remembers that maintaining 3d Led Home Theater Projector information to stay current is a top priority, which is why we are constantly updating our websites. Learn more about us using online sources.

If you think that anything we present here regarding 3d Led Home Theater Projector is irrelevant, incorrect, misleading, or erroneous, then please let us know promptly!

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FAQ:

Q: What is a home theater projector?

A: A home theater projector is, like the name suggests, a device which takes video input from your computer or other video rendering device and projects it onto a special screen or a surface.

Q: What is projection in theater?

A: Projection has various meanings, but what they all have in common is that something is sent out or forward. A movie is projected onto a screen; a skilled actress projects her voice out into a large theater without seeming to shout; and something sticking out from a wall can be called a projection.

Q: What is 3D projection?

A: 3D projection. 3D projection is any method of mapping three-dimensional points to a two-dimensional plane. As most current methods for displaying graphical data are based on planar (pixel information from several bitplanes) two-dimensional media, the use of this type of projection is widespread, especially in computer graphics, engineering and drafting .