Does GetObjectRayCastX() return where the radius was hit for ObjectSphereCast()?

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Golelorn

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Posted: 16th Mar 2020 23:51 Edited at: 17th Mar 2020 00:04

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My coordinates are not on the mesh. You can see I place the boxes at the spot that GetObjectRayCastX/Y/Z return, but its not near the mesh. I am trying to add an avoidance force for walls. But I believe my collisions hits are incorrect. It works for avoiding the other cylinders perfectly, but I just use their position not collision detection.

Is there a way to return where the collision is on the mesh? Or am I doing something wrong in my code below? Thank you.

Thanks.

...
	//pos is the position of the cylinder moving towards the target
        ahead = Addvector3(pos, ScaleVector3(NormalizeVector3(velocity),seeAhead#))
        hit = RayTestWithRadius_navmesh(pos, ahead, wall_level, r#)
	if hit > 0
		wallPos.x = GetObjectRayCastX(0)
		wallPos.z = GetObjectRayCastZ(0)
		SetObjectPosition(raytestbox[index],wallPos.x, 0, wallPos.z)
		avoidance_force = SubtractVector3(pos,wallPos)
		avoidance_force = limitForce(NormalizeVector3(avoidance_force),maxforce#)
	endif
...

function RayTestWithRadius_navmesh(vector1 as vector3,vector2 as vector3,ID as integer,radius#)
	ObjectRayCast(floor_level,vector1.x,5000,vector1.z,vector1.x,-5000,vector1.z)
	vector1.y=GetObjectRayCastY(0)
	ObjectRayCast(floor_level,vector2.x,5000,vector2.z,vector2.x,-5000,vector2.z)
	vector2.y=GetObjectRayCastY(0)
	hit=ObjectSphereCast(ID,vector1.x,vector1.y+radius#+.075,vector1.z,vector2.x,vector2.y+radius#+.075,vector2.z,radius#)
	if hit = 1 or hit = floor_level
		hit=GetObjectRayCastHitID(0)
		if hit=floor_level then hit=0
	endif
endfunction hit

+ Code Snippet

...
	//pos is the position of the cylinder moving towards the target
        ahead = Addvector3(pos, ScaleVector3(NormalizeVector3(velocity),seeAhead#))
        hit = RayTestWithRadius_navmesh(pos, ahead, wall_level, r#)
	if hit > 0
		wallPos.x = GetObjectRayCastX(0)
		wallPos.z = GetObjectRayCastZ(0)
		SetObjectPosition(raytestbox[index],wallPos.x, 0, wallPos.z)
		avoidance_force = SubtractVector3(pos,wallPos)
		avoidance_force = limitForce(NormalizeVector3(avoidance_force),maxforce#)
	endif
...

function RayTestWithRadius_navmesh(vector1 as vector3,vector2 as vector3,ID as integer,radius#)
	ObjectRayCast(floor_level,vector1.x,5000,vector1.z,vector1.x,-5000,vector1.z)
	vector1.y=GetObjectRayCastY(0)
	ObjectRayCast(floor_level,vector2.x,5000,vector2.z,vector2.x,-5000,vector2.z)
	vector2.y=GetObjectRayCastY(0)
	hit=ObjectSphereCast(ID,vector1.x,vector1.y+radius#+.075,vector1.z,vector2.x,vector2.y+radius#+.075,vector2.z,radius#)
	if hit = 1 or hit = floor_level
		hit=GetObjectRayCastHitID(0)
		if hit=floor_level then hit=0
	endif
endfunction hit

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Mesher

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Posted: 17th Mar 2020 00:14

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SetObjectShape = polygon

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Golelorn

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Posted: 17th Mar 2020 00:50

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I believe that is a 3D Physics command. While, I would love to just use those commands, in my experience they are finicky, and we lack the proper documentation to use it in an entire project.

Also, I am already knee deep in vector math, so I might as well go all the way.

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blink0k

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Posted: 17th Mar 2020 02:02 Edited at: 17th Mar 2020 07:14

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Taking the example from the documentation, it appears to return the center of the sphere that collides with the object.
You can find the contact point using GetObjectRaycastX/Y/Z() and GetObjectRaycastNormalX/Y/Z() to cast a ray through the original collision object.

As far as i can see (and i can't see very far) the normals point in the OPPOSITE direction to the contact. So if you use SetObjectLookAt() to look along the normals it will look in the opposite direction.
Not sure if you have to flip them when casting a ray.

//(AGK version: 108.24)
//Submitted: 2014-12-15 17:23:49

// this example should work with AGK V1 and AGK V2

// use the ws key or the on screen joystick to move the sphere
// if the sphere cast intersects the box, the box will turn red
// the green and red sphere are cosmetic so you can see where the start and end of the sphere cast is

// set a radius for the sphere cast
radius# = 20.0

// make a box (this will automatically be position at 0,0,0)
CreateObjectBox(1,50,1,50)
SetObjectCollisionMode(1,1)

// make a green sphere that will have the same radius as the sphere cast and position it
CreateObjectSphere(2,radius#*2,12,12)
SetObjectColor(2,0,255,0,255)
SetObjectPosition(2,-50,0,50)

// make a red sphere that will have the same radius as the sphere cast
CreateObjectSphere(3,radius#*2,12,12)
SetObjectColor(3,255,0,0,255)
SetObjectPosition(3,50,0,50)

// create a directional light
//CreateLightDirectional(1,-1,-1,0,255,255,255)

// position and orientate camera
SetCameraPosition(1,0,200,0)
SetCameraLookAt(1,0,0,0,0)

cylinder = CreateObjectCylinder(100, radius# * 2, 8)
RotateObjectLocalX(cylinder, 90)
SetObjectPosition(cylinder, 0, 0, 50)
FixObjectPivot(cylinder)
SetObjectTransparency(cylinder, 1)
SetObjectAlpha(cylinder, 0x50)

hit=CreateObjectSphere(radius# * 2, 16, 16)
SetObjectTransparency(hit, 1)
SetObjectAlpha(hit, 0x70)

normal = CreateObjectCylinder(100, 1, 8)
RotateObjectLocalX(normal, 90)
SetObjectPosition(normal, 0, 0, -50)
FixObjectPivot(normal)
SetObjectTransparency(normal, 1)
SetObjectAlpha(normal, 0x50)

cast = 1

// main loop
do
		if GetRawKeyPressed(asc("R"))
			cast = 1
		endif

// get player input
        joystick_y# = GetJoyStickY()*-1

// move the sphere
        MoveObjectLocalZ(2, GetRawKeyState(38) -  GetRawKeyState(40) )

// use the spheres to determine the start (old) and end (new) points of the sphere cast
        old_x# = GetObjectX(2)
        old_y# = GetObjectY(2)
        old_z# = GetObjectZ(2)

new_x# = GetObjectX(3)
        new_y# = GetObjectY(3)
        new_z# = GetObjectZ(3)

SetObjectPosition(cylinder, old_x#, old_y#, old_z#)
        SetObjectLookAt(cylinder, new_x#, new_y#, new_z#, 0)

if cast
	        if ObjectSphereSlide(1,old_x#,old_y#,old_z#,new_x#,new_y#,new_z#,radius#) = 0
	                // if the box is not intersected by the sphere cast then color it white
	                SetObjectColor(1,255,255,255,255)
	        else
	                // if the box is intersected by the sphere cast then color it red
	                SetObjectColor(1,255,0,0,255)
	                SetObjectPosition(hit, GetObjectRayCastX(0), GetObjectRayCastY(0),  GetObjectRayCastZ(0))
	                SetObjectPosition(normal, GetObjectRayCastX(0), GetObjectRayCastY(0),  GetObjectRayCastZ(0))	                
	                SetObjectLookAt(normal, GetObjectRayCastX(0)+GetObjectRayCastNormalX(0), GetObjectRayCastY(0)+GetObjectRayCastNormalY(0),  GetObjectRayCastZ(0)+GetObjectRayCastNormalZ(0), 0)	                
	                cast = 0
	        endif
	    endif

print("Use UP/DOWN keys to move green ball")
        sync()

loop

+ Code Snippet

//(AGK version: 108.24)
//Submitted: 2014-12-15 17:23:49

// this example should work with AGK V1 and AGK V2

// use the ws key or the on screen joystick to move the sphere
// if the sphere cast intersects the box, the box will turn red
// the green and red sphere are cosmetic so you can see where the start and end of the sphere cast is

// set a radius for the sphere cast
radius# = 20.0

// make a box (this will automatically be position at 0,0,0)
CreateObjectBox(1,50,1,50)
SetObjectCollisionMode(1,1)

// make a green sphere that will have the same radius as the sphere cast and position it
CreateObjectSphere(2,radius#*2,12,12)
SetObjectColor(2,0,255,0,255)
SetObjectPosition(2,-50,0,50)

// make a red sphere that will have the same radius as the sphere cast
CreateObjectSphere(3,radius#*2,12,12)
SetObjectColor(3,255,0,0,255)
SetObjectPosition(3,50,0,50)

// create a directional light
//CreateLightDirectional(1,-1,-1,0,255,255,255)

// position and orientate camera
SetCameraPosition(1,0,200,0)
SetCameraLookAt(1,0,0,0,0)


cylinder = CreateObjectCylinder(100, radius# * 2, 8)
RotateObjectLocalX(cylinder, 90)
SetObjectPosition(cylinder, 0, 0, 50)
FixObjectPivot(cylinder)
SetObjectTransparency(cylinder, 1)
SetObjectAlpha(cylinder, 0x50)

hit=CreateObjectSphere(radius# * 2, 16, 16)
SetObjectTransparency(hit, 1)
SetObjectAlpha(hit, 0x70)

normal = CreateObjectCylinder(100, 1, 8)
RotateObjectLocalX(normal, 90)
SetObjectPosition(normal, 0, 0, -50)
FixObjectPivot(normal)
SetObjectTransparency(normal, 1)
SetObjectAlpha(normal, 0x50)

cast = 1

// main loop
do
		if GetRawKeyPressed(asc("R"))
			cast = 1
		endif

        // get player input
        joystick_y# = GetJoyStickY()*-1

        // move the sphere
        MoveObjectLocalZ(2, GetRawKeyState(38) -  GetRawKeyState(40) )

        // use the spheres to determine the start (old) and end (new) points of the sphere cast
        old_x# = GetObjectX(2)
        old_y# = GetObjectY(2)
        old_z# = GetObjectZ(2)

        new_x# = GetObjectX(3)
        new_y# = GetObjectY(3)
        new_z# = GetObjectZ(3)

        SetObjectPosition(cylinder, old_x#, old_y#, old_z#)
        SetObjectLookAt(cylinder, new_x#, new_y#, new_z#, 0)


		if cast
	        if ObjectSphereSlide(1,old_x#,old_y#,old_z#,new_x#,new_y#,new_z#,radius#) = 0
	                // if the box is not intersected by the sphere cast then color it white
	                SetObjectColor(1,255,255,255,255)
	        else
	                // if the box is intersected by the sphere cast then color it red
	                SetObjectColor(1,255,0,0,255)
	                SetObjectPosition(hit, GetObjectRayCastX(0), GetObjectRayCastY(0),  GetObjectRayCastZ(0))
	                SetObjectPosition(normal, GetObjectRayCastX(0), GetObjectRayCastY(0),  GetObjectRayCastZ(0))	                
	                SetObjectLookAt(normal, GetObjectRayCastX(0)+GetObjectRayCastNormalX(0), GetObjectRayCastY(0)+GetObjectRayCastNormalY(0),  GetObjectRayCastZ(0)+GetObjectRayCastNormalZ(0), 0)	                
	                cast = 0
	        endif
	    endif


		print("Use UP/DOWN keys to move green ball")
        sync()

loop

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nz0

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Location: Cheshire,UK

Posted: 18th Mar 2020 21:50

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If you are still stuck with this, I've made a routine for my VR lib which places a glow decal on the correct point, at the correct angle on the object face (like the laser pointer you see in VR stuff)

My Robotron remake
My I,Robot remake WIP
My Defender remake
AGK WadPacker - Protect your Media!

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AppGameKit Classic Chat / Does GetObjectRayCastX() return where the radius was hit for ObjectSphereCast()?

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