Refers to games or art assets built in a three-dimensional space, where all positions have X, Y and Z coordinates.

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1answer
225 views

Better way to go up/down slope based on yaw?

Alright, so I got a bit of movement code and I'm thinking I'm going to need to manually input when to go up/down a slope. All I got to work with is the slope's normal, and vector, and My current and ...
0
votes
2answers
336 views

What techniques can I use to render very large numbers of objects more efficiently in OpenGL?

You can think of my application as drawing a very large ball-and-stick diagram (or graph). At times, this graph can get very large, where the number of elements even outnumbers the pixels on the ...
3
votes
5answers
2k views

How are realistic 3D faces created and animated in video games?

I'm interested in being able to create realistic faces and facial expressions for the 3D characters of a game I'm working on. Think something similar to the dialog scenes in games like Mass Effect. ...
4
votes
3answers
1k views

Quaternion dfference + time --> angular velocity (gyroscope in physics library)

I am using Bullet Physic library to program some function, where I have difference between orientation from gyroscope given in quaternion and orientation of my object, and time between each frame in ...
1
vote
1answer
500 views

Transform 3d viewport vector to 2d vector

I am playing around with 3d transformations and came along an issue. I have a 3d vector already within the viewport and need to transform it to a 2d vector. (let's say my screen is 10x10) Does that ...
0
votes
2answers
312 views

Matrix loading problems with jbullet and lwjgl

The following code does not load the matrix correctly from jbullet. //box is a RigidBody Transform trans = new Transform(); trans = box.getMotionState().getWorldTransform(trans); float[] matrix = new ...
-3
votes
1answer
232 views

What graphic programs are used in Wind-up knight [closed]

What graphics programs does Android support? i.e. what graphics programs did Robot Invader use to create Wind-up Knight? Any hints or clues are appreciated Cheers David
3
votes
1answer
349 views

3d Picking under reticle

i'm currently trying to work out some 3d picking code that I started years ago, but then lost interested the assignment was completed (this part wasn't actually part of the assignment). I am not ...
-1
votes
1answer
419 views

Create plane matrix from three 3d points

I have three 3d points (x, y, z). I am trying to create a 3d plane and get a 3d Matrix from those points. The XYZ values are not accurate in this case but should give an idea on what I am looking. ...
3
votes
2answers
149 views

How can I simulate multiple depth channels?

Here's what I'd like to achieve: Rendering a first pass of objects in my scene, using standard depth comparison Rendering another pass of objects in the same scene, but with the following rules: A ...
3
votes
1answer
613 views

3D zooming technique to maintain the relative position of an object on screen

Is it possible to zoom to a certain point on screen by modifying the field of view and rotating the view of the camera as to keep that point/object in the same place on screen while zooming ? Changing ...
2
votes
2answers
933 views

How to load a terrain of connected caves into bullet-phisics engine?

I have a terrain that can not be represented as height map. Say a mountain with caves. I have it in one large .obj file. How do I load such a terrain into bullet-phisics engine? Or I shall generate ...
0
votes
2answers
768 views

Rotate point by a direction vector

Given a vector, A, which represents a point, and a unit vector, B, which represents the looking direction, how would I rotate A so that B is the axis that's looked down on? Let's say the looking-axis ...
1
vote
3answers
286 views

Material usage, one per model or per object?

Is it better (memory, time (of developer), space) to use single model that is unwrapped and uses a single material or to break a model down into appropriate bits, each with their own smaller ...
2
votes
1answer
850 views

Is it possible to billboard a sprite using a transformation matrix?

None of the current topics on billboarding seemed to answer this question. But, given a sprite (or quad) that has it's own 4x4 transformation matrix a camera with a view matrix (a standard 4x4 ...
2
votes
1answer
358 views

Create edges in Blender

I've worked with 3DS Max in Uni and am trying to learn Blender. My problem is I know a lot of simple techniques from 3DS max that I'm having trouble translating into Blender. So my question is: ...
1
vote
2answers
9k views

SDL for 3D game programming?

I have been studying SDL for a few weeks and I have succeeded in making a 2D Ping-Pong game, but I want to get started in 3D development, and I'd like to know if SDL is capable (and suitable) for 3D ...
0
votes
1answer
136 views

Map a fbx model between 2 VertexPositionColor Positions

I have created a VertexPositionColor position and drew it in the XNA like this VertexPositionColor[] backbone; backbone = new VertexPositionColor[2]; backbone[0].Position = new Vector3(0, 22, 0); ...
6
votes
3answers
2k views

XNA: Rotating Bones

XNA 4.0 I am trying to learn how to rotate bones on a very simple tank model I made in Cinema 4D. It is rigged by 3 bones, Root -> Main -> Turret -> Barrel I have binded all of the objects to the ...
2
votes
2answers
1k views

How to rotate an object so it stands correctly (back always facing the camera)

I have the following scene: And I have two 3D vectors, the camera position, and the focus position. The focus vector is always behind the monster. I know how to rotate the camera around the focus ...
1
vote
3answers
476 views

Missing z-axis rotation for transforming between two vectors

I'm trying to rotate a cube so that it's facing up, but am getting hung up on the final implementation details. It now reliably will rotate the x,y axis to the correct side, but the z-axis is never ...
16
votes
3answers
1k views

Can the solar system be accurately represented in 3d space using doubles (or longs)?

I would like know to how to best manage coordinates in a 3D game whose aim is to realistically model the entire solar system, yet be able to handle the smallest movements in a "ship" (ie: perhaps we ...
0
votes
2answers
282 views

Rotate 3D camera relative to what's on screen (in threejs)

I'm trying to have a camera in Threejs react to respective left/right/up/down/forward/backward keys, always based on the direction the camera is currently facing. It works fine left/right ...
0
votes
1answer
849 views

OpenGL : Suggestion on handling collision detection and vertex data?

I was thinking how to do collision detection in my OpenGL application and came to conclusion that I should keep two copies of my geometry data. 1)First copy : Only for OpenGL rendering purposes.This ...
-5
votes
2answers
154 views

Advice on OpenGL 2.1 [closed]

I'm looking to finally get into OpenGL to bring some game ideas of mine to life! As I want to aim for lower class systems I'm probably looking at OpenGL 2.0/2.1 using JOGL (as I know Java the best). ...
0
votes
2answers
412 views

Collision, then what?

I know how to check collision for example 2 spheres. But my question is how do I use the collsion response in a good way? How do I make my character unable to walk in to the Sphere? I've got to the ...
1
vote
0answers
760 views

How to turn a 3d camera (in HTML5 2D Canvas)

A few years back I started experimenting with 3d in canvas. Everything went pretty well untill I had to to turn the camera, I couldn't get it done. A few days back I just happened to stumble upon ...
0
votes
2answers
5k views

Scaling Model in XNA, keep position

I am trying to create a little fun 3D game in XNA, but I am having some problems with scaling my models. I use models from random sites, so my battleship is for an example 10 times larger than my ...
0
votes
1answer
1k views

View frustum, “focal length” and near plane distance

I've been reading through "Mathematics for 3D game programming and Computer Graphics" lately and just when I'd got used to author's lack of qualification of important notions, he striked again. On ...
2
votes
4answers
498 views

3D: How how handle like 500 NPC

I'm currently working on a 3D game. My game have like 10 NPC's and a really small world. But if I want to have a larger world with lots of NPC's? I think it's not a good idea to update and check ...
7
votes
3answers
357 views

Sort Polygons in order - not working?

I'm fairly new to programming in a 3d world. I'm trying to create a canvas where all the objects are drawn in order of furthest-to-closest and from bottom to top - so they don't overlap each other, ...
1
vote
2answers
1k views

Render a polyline with rounded joints

I have a list of points (3D) and want to draw a line connecting all points with a specified width. The line should be rendered in OpenGL (using OSG) as triangles. The real challenge of this task is to ...
3
votes
3answers
2k views

How to calculate the inverse of a 4*4 opengl transform matrix

I am transforming my camera like any other object. I would like to set the view model matrix to the inverse of this so that I can draw the rest of the objects relative to the camera. How do i ...
1
vote
2answers
740 views

Rotate 3D cube so nearest side is facing user

How do I figure out the new angle and rotation vectors for the most visible side of the cube? Why: The user can rotate cube, but when finished I'd like the cube to snap to a side facing the user. ...
1
vote
2answers
192 views

How to export deform modifier animation into a game engine?

Hi we animated a simple plane with deform modifier to give a folding cloth like effect. How do we export it from maya so that we are able to import into our game engine. Can we export them as a ...
3
votes
1answer
362 views

Procedural mesh generation from raytracer

I'm interested in applying the following technique: Define game objects using a object definition DSL similar to what you would use for a raytracer (e.g. POVRay) Use a specialised raytracer to ...
0
votes
2answers
4k views

Why is 3D game development supposed to be so hard? [closed]

This may be kind of a dumb question. I have little experience in programming and no experience in game programming. I've only done simple "if, then" programming and simple circuit board chip ...
0
votes
2answers
1k views

3D: First Person Movement

I've searched and searched for a solution today but haven't found one. I have a Camera with Vector3 and also the camera has an angle. If I use this: hero.position.x += speedX; hero.position.z += ...
3
votes
2answers
811 views

What has the most efficient intersection test against an AABB tree - OBB, Cylinder or Capsule?

I'm currently trying to find collisions in 3D between a tighter volume than an AABB and a tree of AABB volumes. I just need to know whether they are intersecting, no closest distance or collision ...
-5
votes
3answers
896 views

Is it possible to combine Blender with PHP? [closed]

I want to build a web game with Blender and I know PHP. Is it possible to mesh Blender with PHP?
4
votes
1answer
370 views

Clever way to do the Sonic 2 Bonus Stage effect saving memory

What would be a good way to save memory to achieve an effect like this one? http://www.youtube.com/watch?v=K89LkvL9JZ0 We're using pre-rendered 3D. I'm asking this because this naive approach of ...
2
votes
1answer
464 views

multiply matrix by vector: what to do if need to change y-up to z-up?

I multiply a matrix with a position vector to get a new position, however, now I need to change my matrix from y-up coordinate space to z-up. Changing only the matrix won't work: how to apply the ...
0
votes
2answers
711 views

How to compute acceleration by using Kinect device joint positions

I have an application which uses the Microsoft Kinect camera device. At each point I can obtain the position of my hand in the 3 Dimensional space ( X - Y - Z ) and I want to compute acceleration of ...
4
votes
1answer
2k views

Moving a rotated model in XNA

This seems like a simple problem with an equally simple solution that is invisible to me. I have a model that spawns at the origin and looks at my player model wherever it goes. I would like it to ...
0
votes
1answer
1k views

How to create modular/replaceable game/engine code interfaces with c++

I've spent some time when I can spare it experimenting with c++ and at the same time learning a bit about game programming. I like most thought I'd start with creating a simple game engine but with ...
4
votes
3answers
753 views

Model in Maya looks strange, what went wrong?

I am modeling a tank and I don't know what key I've pressed, but now the object in Maya is looking very weird. Does anybody know how to solve this problem?
1
vote
1answer
300 views

3D/perspective Top down shooter bullet issues

I'm developing a top-down shooter with multiple levels (ground for ground units, middle level for buildings, top level for air unity). The problem is the collision. Though I can make the collider ...
2
votes
2answers
2k views

calculate new vertex position given a transform matrix?

How can I get the new position of my vertex given a 4x4 transform matrix or simply 9 floats (positionX, positionY, positionZ, rotationH, rotationP, rotationR, scaleX, scaleY, scaleZ)? Usually I can ...
5
votes
3answers
2k views

Height Map vs 3D Model Mesh

I'm currently working on a 3D PC game (written in C++ and DirectX 9.0) and I'm trying to find the best way to store level data in the memory. The game's action takes place under the ground, so ...
4
votes
1answer
348 views

Translation from one coordinate system to another having Z-offset issues

I'm using ARToolkit to do an augmented reality application, but my problem is really with the 3D coordinates. In this application, I use my webcam to generate the scene. I have two markers (printed ...