24
votes
Accepted
Consistent cross platform procedural generation
The best resource I've found on this topic is Bruce Dawson's blog article "Floating-Point Determinism"
It establishes that yes, in theory, you could get cross-platform determinism out of ...
- 117k
7
votes
Consistent cross platform procedural generation
What I would be trying to do is to generate on multiple levels, where things at one level could be calculated from the level above with integer math.
For example, at the top level I might draw a bunch ...
- 207
5
votes
Accepted
Is it possible to calculate a direction vector without sqrt?
If you want a correct mathematical result (correctly rounded to within floating point precision), a square root is the way to go.
It's true that it's more expensive than a multiply, but it's still ...
- 117k
2
votes
Consistent cross platform procedural generation
As others pointed out, if you want true determinism, then avoid floating point variables and use integer math instead. If you need a large universe, use 64bit integers. Their resolution is good enough ...
- 113k
2
votes
Accepted
Compute the difference between two quaternions and iterate with the difference
Quaternion difference:
C = Quaternion.Inverse(B) * A;
Quaternion division by a scalar:
...
- 117k
2
votes
Move player towards screen
I've thought of a possible solution to this, but it feels really inelegant, so I would be interested in hearing other people's take on this.
My idea is as follows:
Take the position of the player in ...
- 326
2
votes
Increasing Recoil Over Time With 'Diminishing Returns'
Whenever I need a formula that describes a curve, and the curve isn't extremely simple to describe with code, I use an Animation Curve. Despite the name, this feature is useful for any kind of 2D ...
- 3,753
2
votes
Accepted
How do I determine if a given grid coordinate is fully within a triangle?
You seem to be using the centre point of your square as the reference, so I will follow that convention (I'm not familiar with Unity's conventions about this).
You just need to check three ...
- 348
1
vote
Accepted
How to calculate Lv(Xp), Xp(Lv) and NextLvXp(Lv) generically?
I understand that when the progression is defined consequently the XP table is too, even using an algorithm. Most common is to store the values initial character level ...
- 26
1
vote
Consistent cross platform procedural generation
Using a noise-based RNG might be an option? It seems to work well, and generates its numbers via bit shifting, so there's no precision issues to get in the way.
Not sure where the slides are, but the ...
- 121
1
vote
Consistent cross platform procedural generation
Rather than designing your PCG around real number arithmetic and then trying to make it deterministic, it may be easier to start from this constraint and design around it. There are a wide variety of ...
- 151
1
vote
Barycentric coordinates outputting coordinate outside of triangle
It looks to me like you've taken a Barycentric coordinate function designed for determining the coordinates of a point known to be inside the triangle.
It does not account for the way the sign of the ...
- 117k
1
vote
Accepted
τ = r × F, In unity3d/PhysX how do we define r?
This depends on how you are applying the torque.
The AddTorque method (by default) interprets the Vector3 parameter as a torque in world space. That means the ...
- 117k
Only top scored, non community-wiki answers of a minimum length are eligible