Game Development Community

Filter Filter
dev|Pro Game Development Curriculum

Twirling Projectile for Grenade

by Mquaker · 09/04/2011 (10:34 pm) · 7 comments

open projectile.h

add code in 'class ProjectileData : public GameBaseData'
bool misGrenade;

after
/// Should it arc?
bool isBallistic;

open projectile.cpp

add code 'ProjectileData::ProjectileData()'
misGrenade = false;

after
faceViewer = false;
scale.set( 1.0f, 1.0f, 1.0f );

isBallistic = false;

add code in 'void ProjectileData::initPersistFields()'
addField("isGrenade", TypeBool, Offset(misGrenade, ProjectileData), "@brief if true, projectile twirling");

after
addField("isBallistic", TypeBool, Offset(isBallistic, ProjectileData),
      "@brief Detetmines if the projectile should be affected by gravity and whether or not "
      "it bounces before exploding.nn");

add code in 'void ProjectileData::packData()'
stream->writeFlag(misGrenade);

after
if(stream->writeFlag(isBallistic))
   {
      stream->write(gravityMod);
      stream->write(bounceElasticity);
      stream->write(bounceFriction);
   }

add code in 'void ProjectileData::unpackData()'
misGrenade = stream->readFlag();

find and replace code in 'void Projectile::interpolateTick()'
if(dir.isZero())
      dir.set(0,0,1);
   else
      dir.normalize();

replace to
if (mDataBlock->misGrenade) {
	   if (mCurrVelocity.len() < 3.0f) 
		   dir.set(0.0f,1.0f,0.0f);
	   else
		   dir.normalize();
   }
   else {
	   if (dir.isZero())
		   dir.set(0.0f,0.0f,1.0f);
	   else
		   dir.normalize();
   }

and add code same function
if (mDataBlock->misGrenade) {
	   if (mCurrVelocity.len() > 3.0f) {
		   MatrixF xZRot(true);
		   VectorF ZRotVec;
		   MathUtils::getVectorFromAngles(ZRotVec, 0.0f, F32(mCurrTick));
		   xZRot = MathUtils::createOrientFromDir(Point3F(ZRotVec.x, ZRotVec.y, ZRotVec.z));
		   xform = xform * xZRot;
	   }
   }

after
MatrixF xform(true);
   xform = MathUtils::createOrientFromDir(dir);


ok, recompile and add one value to your grenade ProjectileData.
isGrenade = true;

if true, your projectile twirling.
NextNext resource
PrevPrevious resource
More resources


Torque Owner David Robert Pemberton
www.deadlyassets.com
#1
09/05/2011 (5:16 am)
nice addition. will have to give this a try, thanks :-)

D R Pemberton (Rob)
www.dedlyassets.com

Torque Owner Mquaker
Mquaker Studio
#2
09/05/2011 (5:48 am)
@David : thanks.

i added one value for control rotate speed.

open projectile.h and add this code
F32 mRotSpeed;

after
bool misGrenade;

open projectile.cpp and add this code
mRotSpeed  = 0.5f;

after
misGrenade = false;

find 'void ProjectileData::initPersistFields()' function and add this code
addField("RotationSpeed", TypeF32, Offset(mRotSpeed, ProjectileData), 
	   "@brief if isGrenade is true, this value active");

after
addField("isBallistic", TypeBool, Offset(isBallistic, ProjectileData),  
      "@brief Detetmines if the projectile should be affected by gravity and whether or not "  
      "it bounces before exploding.nn");

find 'stream->writeFlag(misGrenade);' in 'void ProjectileData::packData()' function and replace code
if(stream->writeFlag(misGrenade))
   stream->write(mRotSpeed);

find 'misGrenade = stream->readFlag();' in 'void ProjectileData::unpackData()' function and below add this code
if (misGrenade)
   stream->read(&mRotSpeed);

find 'MathUtils::getVectorFromAngles(ZRotVec, 0.0f, F32(mCurrTick));' code block and replace to this code
F32 pitch = F32(mCurrTick) * mDataBlock->mRotSpeed;
MathUtils::getVectorFromAngles(ZRotVec, 0.0f, pitch);

ok, recompile your project.

find 'isGrenade = true;' in your 'projectiledata' and add below this code.
RotationSpeed = 0.5;

Associate Steve Acaster
[YorkshireRifles.com]
#3
09/05/2011 (7:00 am)
How about a video of the code in action?

Torque Owner Mquaker
Mquaker Studio
#4
09/05/2011 (9:05 am)
like this?

Associate Steve Acaster
[YorkshireRifles.com]
#5
09/05/2011 (9:35 am)
Nice graphics ;)

Torque Owner David Robert Pemberton
www.deadlyassets.com
#6
09/05/2011 (2:42 pm)
@Steve Lol

Torque 3D Owner Thomas -elfprince13- Dickerson
#7
09/05/2011 (3:34 pm)
Interesting. I wonder if I could use this for a throwing axe.