Downloading Apps from google play seems to be safer than other application store. Play store has implemented google play protect that runs a safety checks before downloading that app as well as it scans all application in the device and alerts user if there are any other third-party application is malicious. Tim fisher in Lifewire.com explains that Google Play isn’t 100 percent safe and there have been multiple instances where malware was not detected by Google Play protect and entered millions of devices. Here the main thing is not a malware itself but running devices in background without user control is the issue here. Although Play protect runs security checks there are many ways application can misuse any device for example providing update for already installed app automatically from other sources.

Applications in your phone are able to access your contact list, read your messages, record your voice, receive your location data, access your pictures and screenshots and even access your bank details and One-time passwords. Some GDPR laws are protecting our data but sometimes this may not be always true. Asley Carmen in theverse.com says that Faceapp Privacy Policy is not remotely GDPR compliant as well as it says that your data can be transferred to any location where they have a facility. It is storing user location, name and their face image somewhere in the server. No one knows What they are doing with this sensitive information. There are many videos on YouTube which explains Youtube and Facebook are receiving your voice data and providing you Ads. This may or may not be true but they are totally able to do this.

What safety measures we can follow to make our privacy and data safe. To be honest no one can be totally safe, but there are Some of the safety measures that can decrease the amount of data being misused or transferred onto unknown remote server:

• Do not accept all app permissions which are not necessary for application.
• Limit social media exposure
• Always use secure site software or only download from play store and app store
• Use VPN on public Wi-Fi
• Do not keep screenshot and notes of your password, bank details and any other information in your phone gallery and messages.

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360 videos are really interesting to watch in Virtual reality headsets and make feels like you are there and things happening just you can observe and watch all round 360 degree by rotating your head. These video can also be watched without any headsets in a android and ios devices as well as in a computer screen by using mouse to navigate around the scene. There are different headsets available in market where we can enjoy 360 video by just sticking any android or ios phone inside. Smartphones utilizes gyroscope which helps out accelerometer (handles axis-based motion sensing) with understanding which way the phone is facing which makes 360 degree video look really impressive and enjoyable.

Lets focus on topic. these spherical videos are entertaining and fascinating. Some people believe that 360 degree videos are 3D but its not true because 360 videos are video footage wrap around spherical view.to shoot footage in 3D, camera(s) with stereoscopic lenses are used which work as one lens for your right eye, and another lens for left eye which creates a gap between human eyes which therefore shoots footage from human eye prospective and illusion of scene depth can be perceived in those footage. The story does not end here because we are talking about 3D virtual reality to make scene 3D it should contain 3 Dimension (height, width and depth), 3D scene has X, Y and Z value where Z refers to depth of field. 360 degree videos only contain on X, Y values and stereoscopic footage are also separate 2D footage which only creates illusion of depth for human eye. Beside dimensions, for Virtual 3D experience there should be some kind of interaction using electronic control or physically. Lets take example for HTC vibe headset where you can physically walk around the virtual environment and interact using vibe controllers also receive feedback in the form of sound, vibration and update in scene footage.

In conclusion Virtual reality is not just watching a plane spherical footage or combination of two static footage captured by stereoscopic lenses which is fixed and cannot be changed by user. Virtual reality should simulate the real feeling of the environment and also it should receive input from the user and provide appropriate output as expected by user or acceptable by user which make the feeling of actually being there and doing something in real time.

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The process starts from capturing enough images all around the object covering all parts around it from different angle. For better result each point in the scene surface should be clearly visible in at least three high quality images. Using the measurements from these images we can use a Photogrammetry modelling tool to create a 3D model. There are number of Photogrammetry software available such as COLMAP, Meshroom, MicMap, Regard 3D, 3df zephyr etc. Among them 3df zephyr is the best choice because of its result of Geometric structure modelling where it produces pretty much impressive textured 3d model by inputting series of photographs.

Firstly we input images to 3df zephyr software and the software starts calibration and orientation process where it figures outs the order of image with the help of identical feature points and ignores those images which does not match with any other images. The next stage in Photogrammetry pipeline is dense point cloud generation where it generates huge number of cloud points (vertex points) to triangulate them.

After vertex points generated those vertex points are feed to Geometric structuring and modelling process where zephyr algorithm connects every vertex point to create shape of mesh with the help of reference generated from number of images. Zephyr generates more than million triangles which is very high amount of poly count for single asset because Game engine cannot run smoothly in real time experience and may result in Crash or lower frame rate. For lowering poly count we can apply dissemination filter to decrease the number of triangles.

Next phase is texture mapping where the software maps and wraps the texture all around the model. Zephyr might not generate 100 percent true texture so this can be manually done by using other 3D modelling and texturing tools such as 3ds max, Maya or blender. (By exporting triangulated mesh and importing it to 3D modelling and texturing tools). When texture mapping process completed we can export 3D mesh as .FBX or.obj file format.

Is photogrammetry enough for 3d model? It is difficult to say yes or No for this question because photogrammetry models are great piece when pictures covers all parts of model but it is not always possible to cover all parts of real life object because it is not possible to see the bottom part of the statue. Another disadvantage with photogrammetry is detail loss, when we apply dissemination or hole filling filters the model loses details. When we compare the poly count of photogrammetry model and other 3D model which is created using blender. The Blender created 3D model seems much detailed with lower poly count which is good for real time rendering. Therefore we can say that photogrammetry models are good for visualising model and offline rendering but it adds up polygon load for real time rendering so it is not the best idea to rely on photogrammetry model everywhere.

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