Frictional Game Wiki

Link to this comparison view

--- hpl2:tutorials:script:running_up_walls [2013/08/25 18:55]
amn
+++ hpl2:tutorials:script:running_up_walls [2015/07/17 20:32] (current)
amn
@@ Line 1: / Line 1: @@
 ====== Running up walls ======
+This code will simulate the player running up walls.\\
+Since code ends up being too large and thus confusing, i'm dividing it in parts.
-( Writing right now… )
+. How it works
+{{http://s21.postimg.org/cjfsgmqqv/running_up_walls_image_1.jpg?direct&}}
-This code will simulate the player running up walls.\\
+This feature uses areas to determine where the wall is and to detect when the player jumps to it.\\
-Since code ends up being too large and thus confusing, i'm dividing it in parts.
+Using the function //AddPlayerBodyForce// i can simulate the force of each leg running up.
+To get the interval between steps, i'm using //Timers//.\\
+\\
+We declare the area collision:  (//AreaWall1 // is the area covering the wall and //WallRunCollide // is the function.)
+<code php>
+void OnStart {
+	AddEntityCollideCallback( "Player", "AreaWall1", "WallRunCollide", false, 1  );
+}
+</code>
-. How it works
+And this is the function that triggers when the players collides with the area:
+<code php>
+void WallRunCollide ( string &in p, string &in c, int s ) {
+	AddPlayerBodyForce( 0, 20000, 0, false );
+}
+</code>
-This feature uses areas to determine where the wall is and to detect when the player jumps to it.\\
+. Adjusting code +//Timer// +//Loop//
-Using the function //AddPlayerBodyForce// i can simulate the force of each leg running up.
+//BodyForce // function uses large numbers, so i'm using a variable instead:
+<code php>
+void WallRunCollide ( string &in p, string &in c, int s ) {
+	float M = 10000;
+	AddPlayerBodyForce( 0, 2*M, 0, false );
+}
+</code>
-To get the interval between steps, i'm using //Timers//.\\
+This will push the player up just once, so i'm adding a //Timer+Loop // to repeat the impulse (5 times):
-This is how the code looks like now:\\
-We declare the area collision:  (//AreaWall1 // is the area covering the wall and //WallRunCollide // is the function.)
 <code php>
-void OnStart {
+void WallRunCollide ( string &in p, string &in c, int s ) {
-	AddEntityCollideCallback( "Player", "AreaWall1", "WallRunCollide", false, 0 );
+	float i = 0.25; int n = 5; float r = 0;
+	for ( int v = 1; v <= n; v++ ) {
+		AddTimer ( "", r, "RunOnMe" );
+		r = r +i;
+	}
 }
 </code>
+As you can see, the content changed, i moved it to another new function.\\
+I added 3 variables, interval, number and a counter.\\
+These are used in the //for loop.\\
+// This loop will set a //Timer// to call the function "//RunOnMe//" //n// times, on an interval of //i // seconds.//\\
+// \\
+\\
+Below is the new function i created that the //Timers// will trigger:
+<code php>
+void RunOnMe ( string &in t ) {
+	float M = 10000;
+	AddPlayerBodyForce( 0, 2*M, 0, false );
+}
+</code>
-And this is the function that triggers when the players collides with the area:
+This is supposed to be a step, i'm adding a sound:
+<code php>
+void RunOnMe ( string &in t ) {
+	float M = 10000;
+	AddPlayerBodyForce( 0, 2*M, 0, false );
+	PlayGuiSound( "step_run_female_rock.snt", 0.4 );
+}
+</code>
-<code php>void WallRunCollide ( string &in p, string &in c, int s ) {  	AddPlayerBodyForce// ( 0, 20000, 0, false );
+At this point, the code is working fine. You can test it out.
+. Preventions
+Now we have to consider possible bugs.\\
+We don't want to trigger this if the player didn't jump.\\
+It would look weird and just fail cause there's not enough starting force.\\
+We can avoid that using //GetPlayerYSpeed()// function, anything below 1 is not jumping:
+<code php>
+void WallRunCollide ( string &in p, string &in c, int s ) {
+	if ( GetPlayerYSpeed() <1 ) { return; }
+	float i = 0.25; int n = 5; float r = 0;
+	for ( int v = 1; v <= n; v++ ) {
+		AddTimer ( "", r, "RunOnMe" );
+		r = r +i;
+	}
 }
 </code>
+That new condition i just added will stop the code by using the //return // function.\\
+So player may walk into the wall area and not get thrown up by the wall running code.
+. Direction
+We are adding now a small tweak to our code to let the player direct his wall running.\\
+Using //AddPlayerBodyForce // we can add a slight push ahead: ( just to help the player go where he's looking at)
+<code php>
+void RunOnMe ( string &in t ) {
+	float M = 10000;
+	AddPlayerBodyForce( 0, 2*M, 0, false );
+	AddPlayerBodyForce( 0, 0, 0.7*M, true );
+	PlayGuiSound( "step_run_female_rock.snt", 0.4 );
+}
+</code>
+.7<nowiki>*</nowiki> M should be enough, remember this will run on every step. There's 5.
+. Functionality
+This is the end of this guide. With this code you can experiment new functionalities and expand its possibilities.\\
+If you're interested, you can take a look at my code in any script file from my mod Riukka for more developed functions on wall running.
+\\
+Amn.-

Frictional Game Wiki

User Tools

Site Tools

Page Tools