autotrashphysics

Tire temperature and wear

Hi all,

I have developed a one dimension tire condition system that encompasses temperature and wear which influences the already existing tire pressure system.

After much testing, it was deemed not yet ready for racing application and was quite promising for road driving and drifting. Therefore it is turned off by default and can be turned on at the settings menu in the worlds.

A short description of how it works:

• When any frictional forces are generated the tir...
  2023-07-10 10:17:05 +0000 UTC View Post

Progress and outcome of FPS lag hunting

Hi everyone!

Let's start with the FPS hunting. So Unity UI was found to be a big factor in FPS, especially while driving. I will be disabling these out-of-car UI such as minimaps/spectator screen/leaderboard/other when you are driving.
In addition to this, I am also working on simplified tire physics so that Udon doesn't hog FPS so much when driving. This will be required for upcoming game worlds.

At this point, more focus will be put towards solidifying the current driving e...

Secondary culprit of poor VR FPS

Hello,

Other than the tire simulation being very expensive to do in Udon, I did a brief process of elimination on the Touristenfahrten world to see when VR FPS went back up while driving.

• Disabling parts of the world such as all the trees/grass/bushes did not help.
• Disabling many UI canvases visible at spawn seemed to help a considerable amount and I will look further into this.

That is all for now, I will continue to squeeze out more VR FPS out of the w...

Touristenfahrten has poor VR FPS

Hello,

I have noticed that this world has gotten worse VR performance over time. This weekend, I will be working on alleviating some of the performance costs with the goal of increasing FPS for VR.

On a test map with trees and foliage, I was able to get 60 FPS in VR while driving, which should be the target to hit.
Why not try to get full FPS? Reminder that tire simulation in Udon is quite expensive and will take a good chunk out of VR users' frame rates. 60 FPS is better th...

Motorcycle controls (arcade)

Before I post the car physics and game progress, this video shows the arcade steering for the motorcycle. It works, however, I am not satisfied after having tried a MotoGP physics simulator.

Motorcycle progress

I have attempted a few methods of controlling a bike so far and I want to continue persuing a physics-based method. This method is where it doesn't use any artificial forces to keep the bike upright, and only use the steering to balance the leaning once the bike is in motion.

The motorcycle is using the physics-based method in the video above. This does not currently work well over 150 km/h and will require more work.

More on the overall car physics version and game updates in the...

Physics v4 progress

Hi Everyone,

I have been working on this newer version of the code for the past few months. This is not backwards compatible with my current worlds as it was rewritten from scratch with knowledge that I have gained from the first few attempts (v1 to v3).

Here's a summary of what's different:

• More component based. For example it is not hardcoded to 4 wheels, I can have a number of differentials and wheels connected to them. This "Object Oriented Programming" approach is...
  2023-03-23 08:49:58 +0000 UTC View Post

Session lap time display

Hi everyone,

For the past week, I have added a lap time display to the Touristenfahrten world. This will only show players in the instance and you can filter the list by car.

Thanks for you support!

Power source and storage for Udon game systems

Hi everyone,

I have come up with a way to power and balance vehicles that don't use combustion engines such as the hover tank.

What is it?

A reactor powered energy system. It consists of a reactor that provides heat, this heat goes to a turbine, and this turbine provides power to a capacitor for storage.
Devices can tap into this power storage to keep running, and the reactor w...

Transport Game (name pending) Progress

Hi everyone!

A simplified version (more FPS) of vehicle physics is on the way for this game. Featuring wheels that take on curbs correctly.

For the purpose of testing the logic of the transport game, I have imported 20km of my local area. This will be used for testing pick-up and drop-off logic for cargo, job balancing in terms of difficulty and reward, and placement of fuel stations and shops.

Thank you for your support and stay tuned for more updates.

Game Time

Hello,

Thank you for your support. At this stage, I think I have a decent grasp on vehicle/tire physics. Next is to make more interactive experiences by creating game worlds. Two projects are planned, which will result in two new worlds. Additionally, the Udon Test world will also be revamped for people to try out the new mechanics and systems in a sandbox environment.

Transport Game (name pending)

In this game, the plan is to utilise wheeled vehicles ...

Turbo sound update

Hello!

I have updated the turbo sound to conform to the forced induction system upgrades. Going forward, "forced induction" will refer to a turbo and supercharger.

For forced induction, there will be a high pitched whining noise that can be heard over the engine and in the vicinity of the car. For turbos only, there will be a sound of air rushing into the engine that can only be heard up close.

Thank you for your support.

Hand Based Steering Prototype

Hi everyone!

Before we start the new year, I have come up with a prototype that lets you steer with your hands in VR.

What's in the prototype?

• Lets you steer with your hands in VR.
• Show the optimal steering angle (red overlaid steering wheel) in some occasions, and always when the car is oversteering.
• Haptics for going against the steering correction of the car, including understeer and wheel lift.
• Keyboard / gamepad will ov...
  2022-12-30 05:06:34 +0000 UTC View Post

December Update & Supercharger Simulation

Hi everyone,

I wish you all a safe and enjoyable festive season, this may be the last update until January.

To keep up with the goals I have set since September, I have made a new column for the Patreon roadmap on my Trello.

During this end of year period, I will also be taking up a once-off project for VRChat, it involves some sci-fi combat - more information in the next post.

2022-12-21 20:03:20 +0000 UTC View Post

Improved Turbo Simulation

Hi everyone,

I have improved the turbo simulation and it will be up on the Touristenfahrten map.
The calculations have been reworked to have the following:

• Exhaust manifold pressure vs back pressure, this yields more accurate turbo lag results and is now able to have negative boost pressure.
• Better blow off valve logic.
• Better control of the wastegate.
• Per gear boost mapping as demonstrated in the video (only present on the silver car as the oth...
  2022-12-07 14:58:12 +0000 UTC View Post

VRChat New Years 2023 Video Submission

Hi all,

Here is the video submission!

Many thanks.

VRChat New Years 2023 Video Concept

Hello there,

As said in my previous post I was passionate about submitting a video. There will be a submission, and it will promote VRChat Udon creation by showing some car footage - a very simple ~1 minute Udon promotion.

The original vision was to have a custom made filming set and a "hero" car. This way, we would have the maximum visual quality for the video, however, I have become ill and have been unable to allocate time for work. Therefore it will be a mix of new and existin...

Custom editor preview for v4

OK, so the previous post didn't want to embed the image and I have made this post just for that.

Cheers

Projected development roadmap

Hi there,

Small update on the development roadmap. Car physics is currently the number one focus for my Udon work. Unfortunately this has slowed down due to my real work and life. Much of the work since September has been a variety of lunchtime to multi-day background work on the physics. For example, the testing of softbody tires, an alternative reflection method that yields higher quality reflections compared to Unity's Reflection Probe.

The background work consisted ...

Cars roadmap

I have previously said that the next post will be an overall roadmap of development in Udon, however, the subject of car development was too big to be combined with my other Udon work.

What will be different for the cars?

Firstly a new map for the Udon testing world will be created to test cars in different situations.

• Suspension testing, not just speed humps. Actually yes, just more elaborate and lengthier.
• Ground surface testing. Including grass...
  2022-09-22 04:32:32 +0000 UTC View Post

Tire Physics Roadmap

Hi everyone,

I have come up with a roadmap that outlines the development goals and usages of tire physics that are used in my systems.

The current tire physics model is to be ground truth for the feel of driving. Even though it feels nice to drive, the code for it is not maintainable, and is hard to measure.

Three new tire models in development will branch into realism with more maintainable code and is easier to adjust and measure, used for racing and drifting. The second w...

High speed test track

There is now a high speed test track which is a fan recreation of the Special Stage Route X track.