ObjectRayCast & optimization - GameCreators Forum

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Santiago3D

4

Years of Service

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Joined: 11th May 2020

Location: Argentina

Posted: 2nd Jun 2020 17:38 Edited at: 2nd Jun 2020 17:42

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Hello how are you?

I make a query regarding performance.

I have my ammunition, many ammunition !!,

I am generating a fall of FPS to calculate if they are colliding with something.

It would be ideal to be able to say that it only checks if it is colliding with objects that are only visible to ammunition.

For example, an anti-aircraft munition that fires a ship, I'm only interested in knowing if it collides with certain planes that are in a small area.

But I can't find how to generate a system so that ObjectRayCast can only calculate collisions with a small number of selected objects.

IMPORTANT : I use a very lowpoly object to detect collisions, that lowpoly object represent my highpoly aircraft or ship.

part of my code to check the collisions of munition over objects

if _muni[count].vida > 1 
		
				// posicion nueva de la municion ¿choco algo?
				x2# = getobjectx(_muni[count].obj)
				y2# = getobjecty(_muni[count].obj)
				z2# = getobjectz(_muni[count].obj)
				
					//Calcular si va a chocar contra algo
					ObjectRayCast(0,x1#,y1#,z1#,x2#,y2#,z2#)
				 	n=GetObjectRayCastNumHits()
				 	//if n <> 0 then print("GetObjectRayCastNumHits "+str(n))
						
				 	for i = 0 to n-1
						victima = getObjectRayCastHitID(i)
						
						//colision de municion con BARCOS
						for barco_n =_barco.length to 0 step-1
							if victima = _barco[barco_n].obj and _barco[barco_n].obj <> _muni[count].origen 
								 obj = GetObjectRayCastHitID(i)
								  x#=GetObjectRayCastx(i)
								  y#=GetObjectRayCastY(i)
								  z#=GetObjectRayCastz(i)
								  nx#=GetObjectRayCastNormalX(i)
								  ny#=GetObjectRayCastNormalY(i)
								  nz#=GetObjectRayCastNormalZ(i)
								  tx#=GetScreenXFrom3D(x#,y#,z#)
								  ty#=GetScreenYFrom3D(x#,y#,z#)
									crear_explo(0,"red",x#,y#,z#,2)
									_barco[barco_n].vida = _barco[barco_n].vida- random(1,10)
									_muni[count].vida = 1000
							endif
						next barco_n
						
						//colision de municion contra otros aviones
						for avion_n=_avion.length to 0 step-1
							if victima = _avion[avion_n].lowpoly and  _avion[avion_n].obj <>  _muni[count].origen 
								 obj = GetObjectRayCastHitID(i)
								  x#=GetObjectRayCastx(i)
								  y#=GetObjectRayCastY(i)
								  z#=GetObjectRayCastz(i)
								  	crear_explo(0,"red",x#,y#,z#,1)
									_avion[avion_n].vida = _avion[avion_n].vida - random(1,10)
									_muni[count].vida = 1000
							endif
						next					
					next
						
			endif

+ Code Snippet


if _muni[count].vida > 1 
		
				// posicion nueva de la municion ¿choco algo?
				x2# = getobjectx(_muni[count].obj)
				y2# = getobjecty(_muni[count].obj)
				z2# = getobjectz(_muni[count].obj)
				
					//Calcular si va a chocar contra algo
					ObjectRayCast(0,x1#,y1#,z1#,x2#,y2#,z2#)
				 	n=GetObjectRayCastNumHits()
				 	//if n <> 0 then print("GetObjectRayCastNumHits "+str(n))
						
				 	for i = 0 to n-1
						victima = getObjectRayCastHitID(i)
						
						//colision de municion con BARCOS
						for barco_n =_barco.length to 0 step-1
							if victima = _barco[barco_n].obj and _barco[barco_n].obj <> _muni[count].origen 
								 obj = GetObjectRayCastHitID(i)
								  x#=GetObjectRayCastx(i)
								  y#=GetObjectRayCastY(i)
								  z#=GetObjectRayCastz(i)
								  nx#=GetObjectRayCastNormalX(i)
								  ny#=GetObjectRayCastNormalY(i)
								  nz#=GetObjectRayCastNormalZ(i)
								  tx#=GetScreenXFrom3D(x#,y#,z#)
								  ty#=GetScreenYFrom3D(x#,y#,z#)
									crear_explo(0,"red",x#,y#,z#,2)
									_barco[barco_n].vida = _barco[barco_n].vida- random(1,10)
									_muni[count].vida = 1000
							endif
						next barco_n
						
						//colision de municion contra otros aviones
						for avion_n=_avion.length to 0 step-1
							if victima = _avion[avion_n].lowpoly and  _avion[avion_n].obj <>  _muni[count].origen 
								 obj = GetObjectRayCastHitID(i)
								  x#=GetObjectRayCastx(i)
								  y#=GetObjectRayCastY(i)
								  z#=GetObjectRayCastz(i)
								  	crear_explo(0,"red",x#,y#,z#,1)
									_avion[avion_n].vida = _avion[avion_n].vida - random(1,10)
									_muni[count].vida = 1000
							endif
						next					
					next
						
			endif

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fubarpk

Retired Moderator

19

Years of Service

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Joined: 11th Jan 2005

Playing: AGK is my friend

Posted: 2nd Jun 2020 18:15 Edited at: 2nd Jun 2020 19:45

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the simplest way ive found to detect a collision between two object with raycasts returns 1 if true

function checkCollision(objID as integer,objID2 as integer)

local width# as float
local height# as float
local depth# as float
local x# as float
local y# as float
local z# as float
local start_x# as float
local start_y# as float
local start_z# as float
local end_x# as float
local end_y# as float
local end_z# as float 
local object_Hit as integer

//this checks for colliion between an object with any other object and returns its id
width#=(GetObjectMeshSizeMaxX(objID,1)-GetObjectMeshSizeMinX(objID,1))/2 
height#=(GetObjectMeshSizeMaxY(objID,1)-GetObjectMeshSizeMinY(objID,1))/2 
depth#=(GetObjectMeshSizeMaxZ(objID,1)-GetObjectMeshSizeMinZ(objID,1))/2 
 
x#=getObjectWorldX(objID)
y#=GetObjectWorldY(objID)
z#=getObjectWorldZ(objID)

// calculate the start of the ray cast
start_x# = x#-width#
start_y# = y#+height#
start_z# = z#-depth#

// calculate the end of the ray cast
end_x# = x#+width#   
end_y# = y#-height#
end_z# = z#+depth#
 
// determine which object has been hit
object_Hit = ObjectRayCast(objID2,start_x#,start_y#,start_z#,end_x#,end_y#,end_z#)
endfunction object_Hit

+ Code Snippet

function checkCollision(objID as integer,objID2 as integer)

local width# as float
local height# as float
local depth# as float
local x# as float
local y# as float
local z# as float
local start_x# as float
local start_y# as float
local start_z# as float
local end_x# as float
local end_y# as float
local end_z# as float 
local object_Hit as integer	

//this checks for colliion between an object with any other object and returns its id
width#=(GetObjectMeshSizeMaxX(objID,1)-GetObjectMeshSizeMinX(objID,1))/2 
height#=(GetObjectMeshSizeMaxY(objID,1)-GetObjectMeshSizeMinY(objID,1))/2 
depth#=(GetObjectMeshSizeMaxZ(objID,1)-GetObjectMeshSizeMinZ(objID,1))/2 
 
x#=getObjectWorldX(objID)
y#=GetObjectWorldY(objID)
z#=getObjectWorldZ(objID)


// calculate the start of the ray cast
start_x# = x#-width#
start_y# = y#+height#
start_z# = z#-depth# 

// calculate the end of the ray cast
end_x# = x#+width#   
end_y# = y#-height#
end_z# = z#+depth#
 
// determine which object has been hit
object_Hit = ObjectRayCast(objID2,start_x#,start_y#,start_z#,end_x#,end_y#,end_z#)
endfunction object_Hit

or change this for any object returns the id of the collision object

+ Code Snippet

object_Hit = ObjectRayCast(0,start_x#,start_y#,start_z#,end_x#,end_y#,end_z#)

but you may be able to simplify this cast for bullets for example using a heliobject I did in another game

+ Code Snippet

hit=ObjectRayCast(0,getObjectX(heliObj)-2.5,getObjectY(heliObj)-5.5,getObjectZ(heliObj)-5.0,getObjectX(heliObj)+2.5,getObjectY(heliObj)+2.5,getObjectZ(heliObj)+15)

edit when hit was greater than 0 there was a hit

not sure how you do your distance checking but agk has some great math functions at our fingertips I have this function

+ Code Snippet

//*******************************************************************************************	
//gets the distance between two objects passed
//*******************************************************************************************	
function getDistance(objectID as integer,objectID2 as integer)
	distance as float
	vec1=CreateVector3(GetObjectWorldX(objectID),GetObjectWorldY(objectID),GetObjectWorldZ(objectID))
	vec2=CreateVector3(GetObjectWorldX(objectID2),GetObjectWorldY(objectID2),GetObjectWorldZ(objectID2))
	distance=GetVector3Distance(vec1,vec2 ) 
	DeleteVector3(vec1)
	DeleteVector3(vec2)
endfunction distance

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