Adding "simple" collision for trigger and onCollision callback
by Thomas Huehn · in RTS Starter Kit · 05/01/2008 (4:18 am) · 15 replies
In the stock the onCollision callbacks and trigger does not work. The following changes will add this:
In RTSUnit.h:
1.1) Add the "bold" code:
In RTSUnit.cc:
2.1.) After
add:
2.2.) At the end of the file add:
2.3.) Add the "bold" code in void RTSUnit::processTick(const Move *move):
Edit:
2.4) Add the following includes add the top after #include "game/RTS/RTSConnection.h":
In RTSUnit.h:
1.1) Add the "bold" code:
[b] protected: void findSimpleContact(); [/b] public: RTSUnit();
In RTSUnit.cc:
2.1.) After
static S32 sMaxPredictionTicks = 30; // Number of ticks to predict
add:
static U32 sCollisionMoveMask = (TerrainObjectType | InteriorObjectType |
WaterObjectType | PlayerObjectType |
StaticShapeObjectType | VehicleObjectType |
StaticTSObjectType);
static U32 sServerCollisionContactMask = (sCollisionMoveMask |
(ItemObjectType |
TriggerObjectType |
CorpseObjectType));
static U32 sClientCollisionContactMask = sCollisionMoveMask | PhysicalZoneObjectType;2.2.) At the end of the file add:
void RTSUnit::findSimpleContact()
{
// Build list from convex states here...
CollisionWorkingList& rList = mConvex.getWorkingList();
CollisionWorkingList* pList = rList.wLink.mNext;
U32 mask = isGhost() ? sClientCollisionContactMask : sServerCollisionContactMask;
while (pList != &rList) {
Convex* pConvex = pList->mConvex;
U32 objectMask = pConvex->getObject()->getTypeMask();
// Check: triggers, corpses and items...
//
if (objectMask & TriggerObjectType) {
Trigger* pTrigger = static_cast<Trigger*>(pConvex->getObject());
pTrigger->potentialEnterObject(this);
}
//else if (objectMask & CorpseObjectType){
else if (objectMask & ShapeBaseObjectType){
// If we've overlapped the worldbounding boxes, then that's it...
if (getWorldBox().isOverlapped(pConvex->getObject()->getWorldBox())) {
ShapeBase* col = static_cast<ShapeBase*>(pConvex->getObject());
queueCollision(col,getVelocity() - col->getVelocity());
}
}
else if (objectMask & ItemObjectType) {
// If we've overlapped the worldbounding boxes, then that's it...
Item* item = static_cast<Item*>(pConvex->getObject());
if (getWorldBox().isOverlapped(item->getWorldBox()))
if (this != item->getCollisionObject())
queueCollision(item,getVelocity() - item->getVelocity());
}
/*
else if ((objectMask & mask) && !(objectMask & PhysicalZoneObjectType)) {
Box3F convexBox = pConvex->getBoundingBox();
if (plistBox.isOverlapped(convexBox) && serverParent == NULL)
pConvex->getPolyList(&polyList);
}
*/
pList = pList->wLink.mNext;
}
}2.3.) Add the "bold" code in void RTSUnit::processTick(const Move *move):
PROFILE_START(RTSUnit_Misc);
[b]
updateWorkingCollisionSet();
if (!isMounted())
findSimpleContact();
[/b]
// Collisions are only queued on the server and can be
// generated by either updateMove or updatePos
notifyCollision();Edit:
2.4) Add the following includes add the top after #include "game/RTS/RTSConnection.h":
#include "game/item.h" #include "game/trigger.h"
About the author
Contact: torque [AT] ohmtal [DOT] com
#2
05/01/2008 (10:14 am)
Ty :) Trigger is a must have for me. 
#3
Thanks
05/01/2008 (4:33 pm)
Great. I was waiting for someone to write some simple collision detection into the RTS Kit.Thanks
#5
#include "game/item.h"
#include "game/trigger.h"
^_^
05/05/2008 (10:06 am)
Include in the top of RTSUnit.cc the next rows :#include "game/item.h"
#include "game/trigger.h"
^_^
#6
05/06/2008 (2:40 am)
Ups yes i'll complete the post
#7
05/06/2008 (2:46 am)
Additional you may reduce some serverside load only executing the collision ( 2.3 ) if you move or every 5 tick like this:if (mMoveState == ModeMove ) { //only check collisions if moving to save load on many units!
static colskipcounter = 0;
colskipcounter++;
if (colskipcounter % 5 == 0) { //only each 5 ticks!
updateWorkingCollisionSet();
if (!isMounted())
findSimpleContact();
notifyCollision();
}
} 
#9
Why is not so nice to have unit overlapping other unit .....;-)
05/07/2008 (12:09 pm)
The next step in this way is to implement the collisions with Units !!! Why is not so nice to have unit overlapping other unit .....;-)
#10
I just removed player vs player collision in my other game because I wont longer hear the player yelling "I stuck in the monsters and cant move...". As mentioned in another disscussion the collision of 2 (or more) players moving into each other does not work so well.
05/07/2008 (2:04 pm)
@andea I would not add a unit vs unit collision because of slower down the game on many units it's maybe better to handle oncollison and let the unit take a side step. I just removed player vs player collision in my other game because I wont longer hear the player yelling "I stuck in the monsters and cant move...". As mentioned in another disscussion the collision of 2 (or more) players moving into each other does not work so well.
#11
You suggest to use C code or Scripting ??
Is there a tutorial about it ??
Thanks for you attention
;-)
05/07/2008 (10:20 pm)
Mm ok then how can add in my code this way ??You suggest to use C code or Scripting ??
Is there a tutorial about it ??
Thanks for you attention
;-)
#12
05/10/2008 (10:39 pm)
Works perfectly, thanks so much! Man was I in luck that you just posted this. I was looking through posts 5 or 6 years old and people were discussing how to implement this, and then I find one that works great and it was only posted just the other day! Thanks!
#13
01/19/2009 (2:53 am)
@Thomas: I've beeing trying to contact you, but cant found any mail address. Hope you see this, in which case, please send me an email (look for the address in my profile).
#14
01/22/2009 (2:19 pm)
From what i can see, This adds collision support for the RTS Kit? (Is it just drop in, and ready?) 
#15
Next I hope to conquer building collision.
I must go as my units are pushing buildings aside now, I have to fix that.
01/24/2009 (4:07 pm)
Thankee, I've been able to do some cool stuff with this so far. (i.e getting units to push other units out of the way)Next I hope to conquer building collision.
I must go as my units are pushing buildings aside now, I have to fix that.
Torque Owner Guy Allard
Default Studio Name