SketchyPhysics3 Release Candidate 1
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I wish I could just say I weigh 180 and have it be so.
In short the physics engine doesn't support absolute weighting of stuff.
In physics as in real life the weight (mass) of something is determined by how much stuff in it and how dense it is. Steel is denser then wood so it weighs more. Thats why the physics engine uses materials.
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I think mass is determined by density and volume, but weight is determined by mass and gravity. Objects in a weightless environment still have mass... but maybe you could insert a tool that tells you an object's weight, in the thruster power it would take to make it neutrally 'bouyant' in the air?
Oh and can you make the camera reset remember the field of view setting?
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Maybe. But I dont know how to change the fov.
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Camera/Field of view
Drag like the zoom tool or type a number... but I'm not sure if that's what you mean...
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I guess so. But when I do that the simulation resets. How does it get changed in the course of a simulation. I need to know so I know when to save it.
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It isn't! That's the problem! It resets to the default 30 degrees, when the simulation started at 70. This happens in MotorSketch Mesa, at least to me.
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Ah. I see. Yeah Ill fix.
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Is it possible to alter variables within the simulation? I mean being able to control it with keyboard or joystick. I don't want a consistent position. Is that possible? If so, can you give me a script example?
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Be a little more specific..
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I mean like the setvar and getvar scripts. Can it be alterable during the simulation?
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Still not following. What is get/setVar not doing?
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I might not be right. When you wrote that it will retrieve the variable, i thought you could change the variable, like on a control panel slider. it is like two joints controlled with the same name.
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@cphillips said:
I wish I could just say I weigh 180 and have it be so.
In short the physics engine doesn't support absolute weighting of stuff.
In physics as in real life the weight (mass) of something is determined by how much stuff in it and how dense it is. Steel is denser then wood so it weighs more. Thats why the physics engine uses materials.
I understand what you are saying CPhillips, but without density, mass, weight or whatever we call it, some simulations can not be done properly. If you collide a ball of steel with a ball of wood, both of the same size (not mass), the simulation is very incorrect, they both propel in equal force, and that's way wrong. It doesn't matter for gravity as object of different weight will fall at the same speed, but when they collide, it's a new ball game. Material should not be used for this purpose, an object should have a "Mass,Density or whatever" attribute that we can set, regardless of what material we use. Material is for the look.
Take a look at your demo of the car you just did. When the whole car hit the wheel of another, it breaks off, at the same rate as if a wheel hit that wheel. Not very realistic don't you think? Not just for your car demo, but for other simulations. Say, a pool table where the 9 ball is made of gold, then what? it act just as the rest of the balls, that's just not right! We should be able to drop a rock on a piece of wood and have it react realistically. I piece of wood can't just hit a rock and make it fly off the ground!
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The physics material would be entirely separate from the SketchUp material; so you'd be able to set a box to behave like wood, but it could be painted as steel. These materials would be like templates, with settings you can modify, like density and friction. Maybe a material manager could be implemented? The UI's kinda crowded.
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@wacov said:
The physics material would be entirely separate from the SketchUp material; so you'd be able to set a box to behave like wood, but it could be painted as steel. These materials would be like templates, with settings you can modify, like density and friction. Maybe a material manager could be implemented? The UI's kinda crowded.
If it's going to work that way, then it'll be perfect, as long as we can make our own material of course. Do you know for sure that's how it'll be, or you're just guessing?
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That's how it SHOULD be IF it's implemented. That's (I think) how it works in the newton physics playground, so the same kind of thing could be done with SP.
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@wacov said:
That's how it SHOULD be IF it's implemented. That's (I think) how it works in the newton physics playground, so the same kind of thing could be done with SP.
Makes perfect sense to me.
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Hey,how do you make magnets and thrusters work? I can't seem to make them work.
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For an uncontrollable thruster, check the box placed next to thruster in the UI. Then put in a simple value like 5000 in the strength field. If it is a big object, then the number must be increased. A controlled thruster code(placed in strength field)will be like this: -(controller)*value. A simple example will be -(key('space'))*5000. You can replace space with any character on the keyboard. If you have a joystick, you can put in just A or B or X or Y for the buttons. You can also put in lefty or leftx, being y axis and x axis respectively. You can do the same with right in the place of left, for the right stick(if you have one) Remember that if you don't have a joystick, you can still control the lefty and righty with the keyboard. Lefty is w/a/s/d, and righty for the arrow keys. For magnets, check the magnet box in the UI. Then enter a value. Create another object and check the magnetic box. The magnetic object will cling to the magnet. Try a higher value. You can also control magnets. Hope this helps!
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Thanks
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