计算一定角度的box2d脉冲 [英] calculate box2d impulse for a certain angle of impact

问题描述

我有一个球（一个圆形的动态体）在重力条件下作用于表面（蹦床）。

I have a ball (a dynamic body in the shape of a circle) that acts on a surface (trampoline) in the conditions of a gravity force.

当球撞击蹦床（从A点到B点画出图片）时，我想对球进行冲击（蹦床表面正常）。

When the ball impacts the trampoline (drawn in the picture from point A to B) I would like to apply an impulse (normal to the trampoline surface) to the ball.

问题在于我现在使用：

 b2Vec2 impulse = b2Vec2(0, [self fullMass]*[GameMaster sharedInstance].usrTrampolineForce);

 b2Vec2 impulsePoint = _body->GetWorldPoint(b2Vec2(0/PTM_RATIO, -1.0/PTM_RATIO));

 _body->ApplyLinearImpulse(impulse, impulsePoint);

将球垂直（在表面上）向上发送（图中的红色方向），尽管它应该尊重某个现实的轨迹（用黑色绘制）。

Which sends the ball perpendicular(on the surface) up (the red direction in the drawing), although it should respect a certain realistic trajectory (drawn with black).

我如何应用冲动才能获得逼真的跳跃？

How can i apply the impulse to have a realistic jump?

即。请注意，我对球交叉的所有情况感兴趣。例如，球可能落在蹦床上，球仍然应该有正确的轨迹。

i.e. Note that i am interested in all the cases of the ball intersection. for example, the ball could drop on the trampoline and the ball should still have a correct trajectory.

推荐答案

我不读取Objective-C，但问题似乎很清楚：

I don't read objective-C, but the problem seems to be clear:

你的冲动 b2Vec2（0，[self fullMass] * [GameMaster sharedInstance] .usrTrampolineForce）实际上并不包含任何x组件！

Your impulse b2Vec2(0, [self fullMass]*[GameMaster sharedInstance].usrTrampolineForce) does not actually include any x component!

将你的冲动分成x和y分量（伪代码）：

Split your impulse into x and y components (pseudocode):

Impulse_magnitude = Ball_mass * Trampoline_Force
# theta is the angle between the horizontal and your impulse
# this will depend on the angle of the trampoline.
Impulse_x = Impulse_magnitude * Cos(theta)
Impulse_y = Impulse_magnitude * Sin(theta)
# Create your impulse vector
Impulse_v = b2Vec(Impulse_x, Impulse_y)

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