Hi, I'm working on a mod to give players wings.

This is my code to add velocity(have not added in any checks(aka is player wearing wings) to code yet.)

@Override public IMessage onMessage(PacketWingStateChange message, MessageContext ctx) {
		    // This is the player the packet was sent to the server from
		    EntityPlayerMP serverPlayer = ctx.getServerHandler().player;
		    // Execute the action on the main server thread by adding it as a scheduled task
		    //WingsPacketHandler.INSTANCE.sendTo(new PacketWingStateChange(FlightState.NULL), serverPlayer);
		    float yaw = serverPlayer.rotationYaw;
		    float pitch = serverPlayer.rotationPitch;
		    float f = 1.0F;
		    double motionX = (double)(-MathHelper.sin(yaw / 180.0F * (float)Math.PI) * MathHelper.cos(pitch / 180.0F * (float)Math.PI) * f);
		    double motionZ = (double)(MathHelper.cos(yaw / 180.0F * (float)Math.PI) * MathHelper.cos(pitch / 180.0F * (float)Math.PI) * f);
		    double motionY = (double)(-MathHelper.sin((pitch) / 180.0F * (float)Math.PI) * f);
		    System.out.println("pitch:" + pitch);
		    System.out.println("yaw:" + yaw);
		    System.out.println("motX:" + motionX + " motY:" + motionY + " motZ:" + motionZ);
		    serverPlayer.getServerWorld().addScheduledTask(() -> {
		    	serverPlayer.addVelocity(motionX, motionY, motionZ);
		    });
		    // No response packet
		    return null;
		  }

Packets work - here's a log sample:

Quote

...

[09:37:35] [Netty Server IO #1/INFO]: [STDOUT]: pitch:27.900019
[09:37:35] [Netty Server IO #1/INFO]: [STDOUT]: yaw:239.40019
[09:37:35] [Netty Server IO #1/INFO]: [STDOUT]: motX:0.7606768012046814 motY:-0.46792641282081604 motZ:-0.4499063193798065

...

Player does not move at all.

This code is supposed to be used when player is 'flapping' thier wings, it should add velocity in the direction the're looking.

Thanks for the help!

Note: all the comments are from the docs(copy and paste )

You're reaching across threads here.

 

See the warning: http://mcforge.readthedocs.io/en/latest/networking/simpleimpl/

2 hours ago, Draco18s said:

You're reaching across threads here.

 

See the warning: http://mcforge.readthedocs.io/en/latest/networking/simpleimpl/

But

2 hours ago, GiantNuker said:

serverPlayer.getServerWorld().addScheduledTask(() -> {
    serverPlayer.addVelocity(motionX, motionY, motionZ);
});

I'm not changing anything on the Packet thread. It was reading the information right though.

2 minutes ago, diesieben07 said:

• You are still reading yaw and pitch on the network thread.
• Players do not have motion on the server. The client just sends a new position every tick.

so - set velocity on the client?

6 minutes ago, diesieben07 said:

Yes, player movement is completely client-side, the server only validates that the player is not doing something stupid.

Thanks!!!!