Illusion -- Animation blueprint, state machine production, character walking, running and jumping action

One 、 A term is used to explain

Sequence —— A movement .
Mixed space —— Mix different movements . Sort and play multiple sequences .
Animation blueprint —— Play different animations according to the status .

Two 、 Mix space to make walking and running moves

Because the movements of walking and running are relatively continuous , And they are all controlled by speed , So put standby 、 go 、 The three movements of running are mixed together .

1. Create mixed spaces

Right click —— Animation —— Mixed space 1D

Select the corresponding bone

Renamed as “ Walk and run ”.

2. Make a walking and running action

Open the mixing space , In the asset details panel, change the name of the horizontal axis to “ Speed ”, The maximum axis value is changed to 500.

Will stand by 、 go 、 The running animation is inserted into the axis in turn .
Hold down ctlr Drag to see the action changes of the characters .

The mixed space is set .

3、 ... and 、 Animation blueprint

1. Create an animation blueprint

Right click > Animation > Animation blueprint

Select the corresponding bone .

2. Add state machine

Drag and drop “ Output pose ” Of “result” Pin , Add state machine .

3. Add running status

Double click the state machine , Drag and drop “entry” Add state “ Walk and run ”

Click on “ Walk and run ” state .

The switching of walking and running posture is through the speed of the character , So here we need to input values for the output posture .

Mix the space on the right “ Walk and run ” Drag in and out of the pose “result” Connected to a .

Drag and drop the mixed space “ Walk and run ” Of “ Speed ” Pin , Promoted to variable “ Speed ”.

Then we need to get the speed of the character's movement in the event chart bar , OK, pass this value to the blending space to control the output posture .

Open the event chart , Drag and drop “ Event blueprint update animation ” New execution pin of “？Is Vaild” function ——“ Try to get Pawn The owner ” The return value of is the same as “？Is Vaild” The input type of .

• ？Is Vaild—— Determine whether the object is valid . That is, when the player is out of control , It is invalid .

Drag and drop “ Try to get Pawn The owner ” Return value new function “ Get speed ”（get velocity）
Get the speed of the current player .

Because the value of the coordinate axis of our walking and running mixed space is of floating-point type , And the speed obtained is the vector type , So we need to switch again .

Drag and drop “ Get speed ” The return value of , newly build “ Vector length ” function （vecot length）

Hold down ctrl Drag and drop “ Speed ” Variables and Is Vaild Connected to a ,“ Vector length ” The return value is connected to the speed pin .

4. Add standby mode

Double click the state machine , stay entry Add a standby state between walking and running .

Standby state and running state are connected , Because the two need to switch each other .

We still control through the speed variable .

• Speed >10, Switch to running state .
• Speed <10, Switch to standby mode .

A. standby — Walk and run

Click the switch button from standby to running .

Press ctrl Drag the speed variable into

Drag speed pin added “ Greater than ”（>） function , The input values 10

The greater than function execution pin is connected to the result function .

B. Walk and run — standby

Click the go run standby switch button .

Press ctrl Drag the speed variable into

Drag speed pin added “ Less than ”（<） function , The input values 10
The less than function execution pin is connected to the result function .

5. Add jump status

There are three states in jumping ： Take off 、 Jump up 、 Fall

The switching between jumping and running depends on whether the character is in “ Floating space ”, Because there will be cases of canceling the jump in advance , And the switching conditions between these three states are different , So you can't mix these three actions directly , Three states need to be created .

• Floating space , Walk and run —— jump .
• Not floating , Jump up —— Fall .
• Playing time <0.01, Fall —— Walk and run ; jump —— Jump up （ That is, play the next action ）

A. Walk and run — jump

Click go, run and jump .
Drag and drop can enter transition The pin is promoted to variable , Renamed as “ Whether to jump or not ”.

B. jump —— Jump up

Enter jump action , Create a new action “ The rest of the time ” function .

Drag the remaining time to return the value , Create a new less than function , The input values 0.01.
The execution pin of the less than function is connected to the result function .

C. Jump up —— Fall

Drag in “ Whether to jump or not ” Boolean variables , Connect “ be equal to ”（=） function .
That is, switch posture when it is false .

use “ It's not equal to ”（not Boolean） The function has the same effect .

D. Fall — Walk and run

The remaining time function of the falling action , Less than 0.01 Switch state when .

E. Get floating status

Now we need to go back to the event chart , Get the current floating state of the character , Then control the state switching by whether to jump variables .

Drag and drop “ Try to get Pawn The owner ” Return value , newly build “ Get mobile components ” function .

Drag and drop “ Get mobile components ” Return value , newly build “ Falling ”（Is falling） function

Drag in “ Whether to jump or not ” Variables and “ Speed ” The execution pin of the variable is connected ,“ Falling ” The return value of is the same as “ Whether to jump or not ” Connected to a .

Complete logic ：

The animation blueprint needs to be adjusted in two parts ： State machine 、 Event chart .

The state machine is three levels nested ：
1. State tree （ Similar to the behavior tree ）
2. This state is animated
3. The logical relationship of state switching

Some variables are needed to control the state switching , At this time, you need to connect blueprints in the event chart to enter values into variables .