9 replies to this topic

[hiltonwelford]

if a green is set at soft which is slow and the stimp is set at 12 to 13 which is fast.how does the game do the math? at what point does it play slow and at what point does it play the fast? i play a wedge onto the green which stoped on contact and backspun 30ft right? so is the ball landing on slow and backspining on fast?

i mean in real life you cannot have both right? so my question is,how does the game play both?

[clubcaptain]

Add to that the fact that you often get some high bounces on soft on fairways and greens.

[RobC]

It’s how hard or soft the ground is when the ball hits....stimp is how fast the ball rolls along the ground which is also quicker down hill and slower uphill

[✠ davef ✠]

soft or hard is the bounce reaction when you hit the green, stemp is the only factor

in the speed the ball rolls

[jmk59]

It’s how hard or soft the ground is when the ball hits....stimp is how fast the ball rolls along the ground which is also quicker down hill and slower uphill

 

soft or hard is the bounce reaction when you hit the green, stemp is the only factor

in the speed the ball rolls

Either of these are a good answer.  If you want a more mathematical (physics based) description, I can provide one.

[SFR]

From a simulator side I believe I was told that while the ball was bouncing or landing it will reflect the soft med or hard settings but once it gets into the rolling mode the stimp speed will take over.

Similar to what we can experience in the simulator with fairway roll.  If you hit a low burner shot some times it will bounce a few times and stop rather quick but the odd time the LA is low enough that the ball gets into roll mode and now (fairways play as an 8 stimp no matter hardness) you will see a ball roll 300 yards till most times it hits a bunker to stop or goes out of bounds.

So once it starts the roll part of the shot it will use the ground settings.  So for example from soft fairways to hard fairways the roll will be the same but the bounces will be what is different.

[hiltonwelford]

From a simulator side I believe I was told that while the ball was bouncing or landing it will reflect the soft med or hard settings but once it gets into the rolling mode the stimp speed will take over.

great answer.thank you.

[jmk59]

From the math side you have three different physics models at work - a collision model every time the ball hits the ground, then a simple ballistics model as its momentarily in the air again. Rinse and repeat for three bounces, then its just in a rolling model.

 

Rolling Model - Stimp is just a measure of the ground friction scrubbing the ball's forward velocity until it stops.

 

Collision Model - conservation of energy and momentum, both linear and angular.  The Hard, Normal, and Soft relate the amount of energy lost in each bounce (coefficient of restitution, Impact COR and spin COR).

[hiltonwelford]

From the math side you have three different physics models at work - a collision model every time the ball hits the ground, then a simple ballistics model as its momentarily in the air again. Rinse and repeat for three bounces, then its just in a rolling model.

 

Rolling Model - Stimp is just a measure of the ground friction scrubbing the ball's forward velocity until it stops.

 

Collision Model - conservation of energy and momentum, both linear and angular.  The Hard, Normal, and Soft relate the amount of energy lost in each bounce (coefficient of restitution, Impact COR and spin COR).

wow to much information for this small brain lol.

thanks man

[jmk59]

TMI indeed!  All that and no equations, either.

 

I'm hoping that the new Trackman ownership will open access to new data for Andew wrt the ground-ball interactions (fine tune the excess spin back).

 

btw ...you produce some of my favorite courses - thanks.