Post by: Mithra on September 12, 2020, 04:00:27 pm
Description
A simple to use 3d library for qb64. Uses map triangle to display polygons. Simple shading on models. Load multiple 3d objects into the scene and move the camera. Supports loading of wavefront obj files and texture mapping
Download: https://github.com/creamcast/3D-Library-for-QB64
Functions and Subs:
* loadObj (filename AS STRING) load a WAVEFRONT obj file, returns the ID of the object as an integer to be used for the 3d commands
* createTexture (filename AS STRING, image_array() AS LONG) loads and creatures the texture for 3d objects. Provide an 1D array where the textures will be generated and stored
* DISPOBJ (objid AS INTEGER, texture() AS LONG) display the 3d object, provide an object id and texture array that was created using createTexture()
* SETOBJHIDDEN (objid AS INTEGER, n AS INTEGER) Set to 0 for object to be hidden, set to 1 to be rendered
* SETOBJX (objid AS INTEGER, x AS FLOAT) set object x coord on the 3d plane
* SETOBJY (objid AS INTEGER, y AS FLOAT) set object y coord on the 3d plane
* SETOBJZ (objid AS INTEGER, z AS FLOAT) set object z coord on the 3d plane
* SETOBJPOS (objid AS INTEGER, x AS FLOAT, y AS FLOAT, z AS FLOAT) set object x y z coord on the 3d plane
* SETOBJROT (objid AS INTEGER, xr AS FLOAT, yr AS FLOAT, zr AS FLOAT) set object x, y, z rotation
* ROTATEOBJX (objid AS INTEGER, deg AS FLOAT) rotate the object on its x axis by degrees
* ROTATEOBJY (objid AS INTEGER, deg AS FLOAT) rotate the object on its y axis by degrees
* ROTATEOBJZ (objid AS INTEGER, deg AS FLOAT) rotate the object on its z axis by degrees
* MOVEOBJX (objid AS INTEGER, n AS FLOAT) move object x position by n
* MOVEOBJY (objid AS INTEGER, n AS FLOAT) move object y position by n
* MOVEOBJZ (objid AS INTEGER, n AS FLOAT) move object z position by n
* SETOBJSCALE (objid AS INTEGER, x AS FLOAT, y AS FLOAT, z AS FLOAT) set object xyz scale. set all to 1 for original size.
* ROTATECAMX (deg AS FLOAT) rotate the camera x by degrees
* ROTATECAMY (deg AS FLOAT) rotate the camera y by degrees
* ROTATECAMZ (deg AS FLOAT) rotate the camera z by degrees
* MOVECAMX (n AS FLOAT) move cam x position
* MOVECAMY (n AS FLOAT) move cam y position
* MOVECAMZ (n AS FLOAT) move cam z position
You can also modify the object through the global variable g_objects:
TYPE OBJECT
id AS INTEGER
polygon_index_start AS INTEGER
polygon_index_end AS INTEGER
x AS FLOAT
y AS FLOAT
z AS FLOAT
rotx AS FLOAT
roty AS FLOAT
rotz AS FLOAT
scalex AS FLOAT
scaley AS FLOAT
scalez AS FLOAT
billboard AS INTEGER
hidden AS INTEGER
END TYPE
Sample Code:
Code: QB64: [Select]
- '$INCLUDE: '3d.bi'
- G_MAINSCREEN = NEWIMAGE(1024, 768, 32)
- SCREEN G_MAINSCREEN
- DIM obj, obj2
- 'load and create texture and store in tex()
- createTexture "dice.png", tex()
- 'load dice 3d model
- obj = loadObj("dice.obj")
- 'load 3d model of an arm
- obj2 = loadObj("arm.obj")
- 'place camera at -1000,0,1000 on 3d plane
- g_cam.x = -1000
- g_cam.z = 1000
- g_cam.y = 0
- 'rotate camera on y axis by -45 degrees
- g_cam.roty = -45
- 'move arm object to the left
- g_objects(2).x = -250
- 'rotate objects every frame
- ROTATEOBJX 1, -1
- ROTATEOBJY 2, -2
- 'fly into the objects at 45 degree angle
- 'display objects
- DISPOBJ 1, tex()
- DISPOBJ 2, tex()
- LIMIT 60
- DISPLAY
- '$INCLUDE: '3d.bm'
Screenshots:
Post by: STxAxTIC on September 12, 2020, 09:05:41 pm
Beautiful work. A project after my own heart! We have maybe a half-dozen (non-silent at least) members who dabble in proper 3D projections - this work is definitely a good asset for us. In fact, it may be worth opening a new sub-section on the forums that has to do with 3D without explicit _GL calls (i.e. MapTriangle only).
Post by: Mithra on September 12, 2020, 10:52:03 pm
Mithra -
Beautiful work. A project after my own heart! We have maybe a half-dozen (non-silent at least) members who dabble in proper 3D projections - this work is definitely a good asset for us. In fact, it may be worth opening a new sub-section on the forums that has to do with 3D without explicit _GL calls (i.e. MapTriangle only).
hey I'm glad it will help and contribute to the 3d community. I was able to dig up other models with textures to create a better example scene, the texture mapping seems to be working really well.
Post by: Ashish on September 13, 2020, 01:46:36 am
If you are interested, you can also have a look at my OBJ-loader (especially the loader, not the GL rendering part).
https://github.com/AshishKingdom/OpenGL-OBJ-Loader
Post by: Unseen Machine on September 13, 2020, 03:00:44 am
The load/render code we've had for ages so i'll gloss over that. What really impresses me is all the other functions, especially the rotating of objects, that's always been a pain in my butt! So hats of to you, i'll defo play around with this in the future.
Attached are Quake 1, Quake 2 and Quake 3 model loaders (the Quake 3 one is still very much a work in progress) that all use OpenGL, all you'll have to do it convert the render functions to Maptriangle and they should work. Fell free to convert them and add to your engine. I'm happy to help anyway i can.
Unseen