3D Synthezier
Table of Contents
1. Operating principle
Parses scene definition language and creates 3D world based on it. Result will be in a wavefront obj file, witch can be then visualized using external renderer.
Basic concept of defining scene is:
- Simple and primitive objects are created on point and polygon level.
- More complex ones can be created my combinig already existing ones, while applying various transformations on them.
Objects with all its subobjects can be rotated, mirrored or resized omong any axis. Generator has built in cache for data input and output to minimize file access.
Examples:
Download Blender files:
| file | size |
|---|---|
| rectangular city.blend | 3.6 MB |
| hexagonal city.blend | 21 MB |
They were produced by importing generated wavefront obj files into Blender.
1.1. Rectangular city
1.2. Hexagonal city
2. Scene description language
See also examples.
2.1. here
here
defines new segment
2.2. p
p x y z
defines new point
2.3. f
f p1 p2 p3 p4
defines new polygon, p4 may be unused
2.4. warn
warn <message>
displays warning message, and wait for key
2.5. end
end
terminates parser
2.6. mtl
mtl material
selects material
2.7. mtlrnd
mtlrnd material ...
selects random material from list
2.8. obj
obj object xz45 xy20 x+3 y*2
includes sub object, can be rotated moved or resized, across X Y Z. If object name begin vith ~ then it will be loaded from current directory. if object name ends with ~ then object will be parsed directly from file, and not chached, to allow loading of greater than 500 lines files.
2.9. rnd
rnd p^1^2^3 p^7^2^1
select random command to execute, ^ will be converted to spaces.
2.10. #
# whatever text
comment
2.11. out
out file
specify output file name, must be first command
2.12. set
set variable contents
set variable contents, variable must be number, contents can be string. max variables is 100. first is 0.
2.13. variables usage
anycommand %1 anything
inserts variable 1 contents info line
2.14. cmp
cmp flag string1 string2
compares strings, and inserts TRUE to flag, if they are equal, else inserts FALSE. max 9 falgs, 0 first. Each subobject has its own flags.
2.15. ?
?flag anycommand
executes command if flag is true.
exapmle: ?3 obj car z*2 xy45
2.16. dum
dum
dummy function, does notheing
3. Installation
Edit bin/3dparse.bas file and update include path in there.
3.1. System requirements
| software | tested version |
|---|---|
| DOS | 6.22 |
| QBasic | 4.5 |
3.2. Directory layout
- bin
- 3dparse.bas
- 3D generator main executable
- city1.3d
- city with square-like buildings
- city2.3d
- city with hexangular buildings
- result.mtl
- shared material library
- *.bat
- quick launch scripts
- include
- 3D objects used to compose the scene
4. Usage
Make sure you have QB binaries in your PATH. Execute
bin/city1.bat
or
bin/city2.bat
to generate example cities. After parsing is finished, appropriate *.obj files will appear in the bin directory holding generated scene. Visualize scene with your favourite renderer.