Questions tagged [transformation]
Transformation in game development is usually refers to linear algebra operations on points, vectors and matrices.
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Setting object O2 to have the same geometric relation to P2 as O1 has to P1
I'm trying to place Object O2 with the same relation to P2 that O1 has to P1, like shown in the picture below.
This is a problem that I'm facing trying to implement portals in Unreal Engine 4, where:
...
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Unity - Transforming horizontal distance between two spriteRenderers to set UnityEngine.UI.Button width to this distance
In my Unity scene, I have a couple of spriteRenderers and a UnityEngine.UI.Button called ...
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1answer
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Free camera navigation and pre-defined locations
I have an interactive scenery app written in Unity, where users can freely navigate the camera through the scene. What I want to do now, is to let user automatically fly to some "hotspots" ...
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When using transformation matrices, how does one convert orientation and scaling from a global frame of reference into a local one?
Note: I'm certain I cannot be the first to answer this question. Unfortunately, the answers I need are buried under an avalanche of posts asking how to move coordinates between frames of reference, ...
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How to calculate the dot product between the input direction and a character with root motion?
I need to calculate the dot product between my character movement direction and the input being pressed by the player. When the character movement was being controlled only by code, I was using ...
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How do I bring a child object in its original position after it is translated and rotated?
This is the original position of the cube and its child object cone.
Over here, I have translated the cone for 2 units
Now I have rotated the parent cube around 25 degrees wrt to the Y-axis
If we ...
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How to re-calculate orientation vectors when one of them is being changed?
I want to implement a Unity-like API for my transforms, with the ability to set forward, right, up vectors directly and change object's rotation quaternion accordingly.
I got stuck at the math behind ...
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How to change the geometry of the scene in Unity?
I'm trying to experiment with 3D spherical geometry in Unity, but it seems like Unity objects are inherently set in flat space. My first idea was to create a class inheriting from ...
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Position/orient parent to place child at a particular position/orientation
I have a GameObject for which I know its world position and rotation.
From another app, I receive a new rotation and position, which should represent the local position and rotation of my GameObject.
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My arcball camera does a roll when it shouldnt be
I am trying to build an arcball camera and it's mostly working, the problem is that as you rotate around the object you have selected (orbit_target_pos in the code),...
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1answer
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How to scale major and minor radius of a quarter torus
I am dealing with quarter tori as in the image below. My issue is that I need to be able to scale its major radius and minor radius separately using a scale matrix. However, when I use a regular ...
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Rotating Cannon's Mouth Toward Player
I am trying to make my cannon mouth rotate towards player, but the rotation is messed up and up I don't know how to fix it.
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How to align Blender animation to external mesh data?
I'm building a custom engine and I have a confusing asset pipeline. I have skeletal animations in Blender and voxel mesh data in Qubicle. My engine loads the skeletal data and applies joint ...
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In practice, is it better to store Euler angles or store three vectors represent as “front/right/up”?
I'm writing a game engine, and when it comes to the transform part, I just use the representation which unity/ue uses, that is: a vector for the position, a vector for Euler angles, and a vector for ...
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What is the signifigance of the Dot Product in World to Local Transformations?
Looking for help understanding why this World to Local Space function works.
I'm working my way through Buckland's Programming Game AI By Example The following function is used in the book to convert ...
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1answer
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Moving a GameObject to a position, waiting, and then moving it again
Hello hello :) Ive been attemping to move a platform (a door basically), and it has partually worked. What works so far is i can move an object from A to B and wait, however it will not move it ...
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Should 3D transformations be represented by a 4x4 matrix or a 3x4 matrix?
Since 3D transformations are represented by 4x4 homogeneous matrices we know that their last row is always (0,0,0,1), and as such the behavior of this final row is implied so long as we know whether ...
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Game Maker - Selecting tiles in an isometric grid
I have implemented an isometric grid with rotation in 2 directions in Game Maker. I did this by first calculating the points of the grid in 3D space and then converting them to 2D points through ...
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Projecting Coordinates from one Space into another, but with “twisting”
i'm trying to generate a decal mesh kinda like this: http://blog.wolfire.com/2009/06/how-to-project-decals/
but instead of projecting the decal with a box, i need to project it with a sort of ...
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1answer
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Scaling a rotated child with parent-child transforms
In unity, if you parent something to another object, then give the child some rotation, and scale the parent, the scale applies to some arbitrary axis to the child, here's some pictures to demonstrate:...
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Static function is being called, but if statement within is not working
I am trying to make a game where upon the player stepping on a block, the block will change color. I am doing this by using transform.position with the player character being recognized as 1 above in ...
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Move gameObject in its facing direction
I have the following four gameObjects, they have, respectively, the rotations: -90, 0, 90, 180. I want them to move as denoted in the image below
This is what I got so far:
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Mathf.Round returning wrong values
I want to check if the Y position is changing or not for the player and the enemy. If it has changed in the frame I want it to return true and if it didn't I want ...
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How to store 3D entity position, offset, and transformation data for parent and children?
I am looking for a cleaner pattern to storing character position data, offsets, and transformations. I currently have a character with a vec3 for position.
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How to prevent rendered wound from sliding on moving character?
I am trying to display a rendered wound on the character, but I still can't figure out how to display it properly without sliding on character's body.
I'm following this link on rendering the wounds ...
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1answer
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Making sense of the positions of gameObjects
Project files: https://github.com/Sebastian-Nielsen/makingSenseOfPositions
Note: There are no scripts running, all I am doing in between each picture is manually changing the x-coordinate in the ...
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getting data from an array stored in a different script Unity [duplicate]
LandingScript w = GetComponent<LandingScript>();
foreach (Transform x in w.Waypoints)
{
allWaypoints[i] = x;
i += 1;
}
i want ...
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1answer
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2D engine design/architecture: transformations
Hello! I'm working on this hobby little 2D engine in JavaScript because I want to learn how all this things are implemented and architectured in general. Internet is full of resources but most things ...
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1answer
138 views
Raycast wrong direction
I use Physics.Raycast and transform.forward to shoot a ray in front of my gameobject, but the ray gets cast downwards instead.
<...
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1answer
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How to align a 3D object with four points?
I'm sure there's a better way to articulate this question, but I lack the vocabulary.
Imagine a skateboard. As it rolls straight down a road, the "deck" is aligned with the road, just offset a few ...
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1answer
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How to calculate the transformation such that two points with different position, orientation and origins line up?
Let's say you have two different 3D Objects which both contain a node that is off center (not at the origin) and have an orientation. How do you calculate the transform for one of the object so that ...
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1answer
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Calculate Discrete Fourier Transform by using c#
There is a definition of Discrete Fourier Transform:
I want to calculate amplitude and phase of a transformed sequence.
I tried :
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0answers
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Set parent by property
In the editor's hierarchy, if I drag and drop one object onto another, the second becomes the parent of the first, and moving the parent will cause the child to move. I see I can set this relationship ...
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Nested transform.position in Unity
The following code works so good , but it is so long.
How can I use a for loop to write a short script for any number of prefabs?
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1answer
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What does the Node2D transform property do?
Following a Godot tutorial I encountered the transform property, but I'm not sure what it means nor how to use it.
I read the official Godot documentation, but it ...
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1answer
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Creating object in front of player, with some distance
I want to create objects in front of player with some distance, so that prevents hit with player immediately. So first, I get the global player position and direction vector which player towards:
<...
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1answer
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After rotated by Z-axis, X/Y axis still rotating just like z is 0
I'm making aerial vehicle controller, which can rotate 3 axis: X(Pitch), Y(Yaw), Z(Roll).
Rotating x(pitch) and y(yaw) axis works fine, however after I rotated z(Roll) axis, x/y rotation gave me ...
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Unwanted angular velocity in unrelated axis (rigidbody simulation)
so real quick I'm simulating 3D rigidbody dynamics. This is what I have:
...
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1answer
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Changing node's translation affects to sibling node
I have a node which looks like this tree:
FPSController (Root node, and it's KinematicBody)
CollisionShape
Camera
GroundCheckRayCast
When I moved CollisionShape's location down, camera also going ...
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1answer
130 views
Follow 3D Path Around Sphere
I have currently have a path that wraps around a Sphere from one side to another - this is basically a 3D highway in the sky type object that is a textured road. I have an Aircraft model that I can ...
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1answer
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What are the “axes of a matrix” exactly?
I am currently learning about game engines, and for the engine math, there are functions called GetXAxis, GetYAxis, and GetZAxis that returned the X, Y and Z axes for a matrix. These functions return ...
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2answers
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How can I find the offset rotation and position between two objects in 3D?
I have two objects in 3 dimensions, one of them (Child) is attached to the other one (Parent) using the offset between them (XYZ ...
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0answers
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How to calculate rotations for an object with scaling transformations?
I am working on implementing scaling transformations into a game engine (C++), which previously assumed only translations and rotations. Visually, the scaling works, but a lot of the game logic ...
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1answer
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Prevent Animation Tab from changing the position of an object
I am quite new to Unity. I am using the latest version. When I try to make a door open animation, it goes well with rotation. But when I add the position property it takes it to the ...
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1answer
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What should the Z coordinate be after transformed by the projection matrix?
I'm working on an OpenGL 1.x implementation for the Sega Dreamcast. Because the Dreamcast didn't have any hardware T&L the entire vertex transformation pipeline has to be done in software.
What ...
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1answer
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Unity 3D rotating object around 2 axes rotates it around 3
I am developing a 3D space shooter and I've fount that when triying to rotate the ship using X and Y axes it also rotates on the Z axe.
The answer
here helped me a lot, but now when I try to rotate ...
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1answer
229 views
C++ Assimp - Transformation Hierarchy
I have a question regarding model imports using ASSIMP. I've been working on an Entity and Component (e.g. unity gameobject component) based game engine for fun and to learn in my spare time. I've ...
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2answers
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Mimicking enemy boss movement of Wonderboy in Monster Land
I want to imitate the movement of the "Death" boss enemy in Wonderboy in Monster Land.
At first, I thought it just moves with a sine wave, but it's not. The up and down movement is erratic.
I ...
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2answers
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How to access specific child indices (directly, not using tags or searches)?
I have a game object whose prefab is structured a very specific way. It is a conveyor belt. I intend to arrange them end-to-end and animate them all at once using a script. Right now I am trying to ...
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1answer
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Bullet prefab gets stuck to target after hitting
As the title says, I am having an issue with prefabs: I am trying to make a bullet follow a curve and then hit a target using this method:
...
