I continue to have fun modding in minecraft.

 

If I have two Vec3 instances, and I want to find the midpoint between them, then I find myself doing a lot of manual math.

 

In theory, it should be

 

vec2 - vec1 = vecDiff

midVec = vec1 + ( vecDiff * scalar_of_0.5 )

 

I can't see an elegant way to do this scalar multiplication on the Vec3 class, and end up with the following.

 

Vec3 diffVec = ent2Vec.subtract( ent1Vec );
Vec3 halfVec = new Vec3( diffVec.xCoord / 2, diffVec.yCoord / 2, diffVec.zCoord / 2 );
Vec3 midPoint = ent1Vec.add( halfVec );

 

Am I missing the obvious?

 

Is there a cleaner way to say something like this made up function below?

 

halfBetween = betweenVec.scalar( 0.5 )

 

So I could get to

 

Vec3 midPoint = entVec1.add( entVec2.substract( entVec1 ).scalar( 0.5 ))

 

 

Wow, that was fast.

 

Do I need to do casting into Vec3 at the end, or will forge functions take a Vector3d as a parameter transparently.

 

Happy to stare at examples, if there are any...

While I am scratching around in here, am I going mad, or does

 

Entity.getVectorForRotation(float pitch, float yaw)

 

take parameters in degrees

 

but

 

Vec3.rotateYaw(float yaw)

 

take parameters in radians

 

Ouch...

 

 

Wow, that was fast.

 

Do I need to do casting into Vec3 at the end, or will forge functions take a Vector3d as a parameter transparently.

 

Happy to stare at examples, if there are any...

 

Minecraft's vector classes aren't compatible with the

javax.vecmath

classes, you'll need to manually convert between them (i.e. create a new instance of the other vector class using the same coordinates as the existing vector).

Vec3 does have a lot of math methods though. Are you sure none of them work for your case? Looking at the type hierarchy there are subtractions, additions, dot products, multiply, get intermediate, normalize, etc.

 

 

I believe dotproduct and crossproduct are vector applied to vector, not scalar to vector

 

I don't see a "multiply" is it present in your version? if so, what version are you in.