GDI+ 3D Engine (Models, Shading, Rotation, Scaling, etc.)

[minxomat]

Hi there again!

This 3D Engine is completely written in AutoIt, except for the drawing functions from GDI+. No 3D libraries were used, every calculation is done manually.

I seriously dislike GDI+. I wrote this Engine a few months ago in plain AutoIt (using virtually no Includes at all) only utilizing the Graphics Control. It came out that polygon drawing using only GDI is suprisingly fast. For AntiAliasings sake and because of a few people who would like to see how it's done in GDI+, i converted it. Now the smoothing can be used at the cost of FPS. (There is still a FPS drop even with no smoothing at all...).

So what features does it have?

• Own scene file format, quite similar to OBJ.
• Dynamic face size (3 to ~20 vertices)
• Light-affected shading (flat shading of course, Gaussian/Phong is going to be implemented later)
• Effective z-ordering, therefore culling is possible
• Real perspective drawing (unlike UEZ textured cube which is parallel mapped for example)
• Translation
• Rotation
• Fog emulation
• Variable shading intensity
• Zooming

 

The model format is easy to use. 4 models are included (standard geometry).

The framerates are acceptable. The plain GDI Version scored about 120 FPS (with buffering). This GDI+ version is a few lines shorter and has fancy smoothing, but runs with max. 80 FPS without AA and max 45 FPS with full AA for me in 800x600.

There is a fullscreen mode which if set, ignores the width / height paramter. (Remeber: FPS also heavily depend on resolution).

I know the code is a huge mess, but it is the fastest way to do it. Please do not recommend for loops instead of Do's etc. (newer Au3 version show a serious performance drop when using For...).

Have fun! 

3da.zip

[UEZ]

Good work minx!   

The parallel mapped textured cube is unfortunately a limitation of the GDI+ function (_GDIPlus_DrawImagePoints). I didn't find a way using built-in functions to map textured surfaces which are displayed in correct perspective.

Br,

UEZ

[minxomat]

If you have a texture, you can map it using a custom built polygon draw function. Unfortunately AutoIt is too slow for that. Maybe i'll give Inline ASM a try on that 

[UEZ]

I'm talking about GDI+ built-in functions and there is already a working solution using ASM

Br,

UEZ

[KLM]

Thanks

[minxomat]

I know what you are talking about. But there is no working solution in ASM yet, at least definitely not how i want it 

[robertcollier4]

I seriously dislike GDI+. I wrote this Engine a few months ago in plain AutoIt (using virtually no Includes at all) only utilizing the Graphics Control. It came out that polygon drawing using only GDI is suprisingly fast.

The plain GDI Version scored about 120 FPS (with buffering). This GDI+ version is a few lines shorter and has fancy smoothing, but runs with max. 80 FPS without AA and max 45 FPS with full AA for me in 800x600.

Could you share your plain GDI version? I am interested in the plain version with no includes and ultra speed. Thanks!

Edited September 5, 2013 by robertcollier4

[minxomat]

The script attached is the GDI version. I've added File.au3 for simplicity. This version is compatible with the scene files from the start post, but the code isn't as clean as the GDI+ version. 

3DEngine.au3

[robertcollier4]

Thanks, just what I was looking for to start learning GDI Plain. If you also have any other links talking about advantages of using GDI Plain over using GDI Plus - that would be much appreciated.

Edit: Previous results were skewed due to GDIPlain version showing FPS with GUICtrlSetData instead of WinSetTitle which was slowing it down. GDIPlain indeed is faster than GDIPlus. With FPS() functions in both showing FPS using WinSetTitle(), showing Cube.3DA I get 440 fps with GDIPlain and 310 fps with GDIPlus. (Test machine is WinXP SP3 x86 with Intel HD 4000 Integrated Graphics). Thx!

Test cases of both with anti-aliasing off:

GDI Plain:

StartUp(800, 600, False, 0, 0, 0, 0, 0, 0, 900, 999, 0.5, True)
LoadModelFromFile(".\Cube.3DA")

GDI Plus:

ASE_Initialize(".\Cube.3DA", 800, 600, False, 0, 0, 0, 0, 0, 0, 900, 999, 0, 0.5, 0)

Edited September 5, 2013 by robertcollier4

[minxomat]

As i said, i didn't optimize the loops for the old Version, so it could be slower. If you want to see other advanced examples for plain GDI check my processing UDF and the examples given.

 

I do not recommend to use GDI instead of GDI+. But i like to use GDI, or, if it is a more graphic heavy application, i switch to ogl4au3-2 oder DirectDraw. It is just fun to see what is possible with the Graphics Control  :gradulated:

// Yes, the GuiCtrlSetData slows it down a bit due the doublebuffer apllied to all controls. But if it works now, fine

Edited September 5, 2013 by minx

[Gianni]

Hi

Does someone knows of a simple 3D modeling software that supports this "3DA" file format ?

P.S.
I found this: MetasequoiaLE R3.0 freeware (see at bottom of that page for the freeware version)  but it does not support "3DA".
Its native format "mqo" is similar but not compatible.

(it works without installation, just unzip it in a folder and run it)

thsnks

Edited April 25, 2014 by PincoPanco

[JRowe]

Hi

Does someone knows of a simple 3D modeling software that supports this "3DA" file format ?

 

While well off topic, you might want to look for software capable of both importing and exporting 3da and convert between formats. Convert to .obj and then back to .3da when you need to.

[Gianni]

While well off topic, you might want to look for software capable of both importing and exporting 3da and convert between formats. Convert to .obj and then back to .3da when you need to.

 

Thanks, but it's exactly what I am not finding.

sorry for the off topic trespassing.

anyway I tryed to build this double piramid (by hand) but some strange contorsions are shown...

8
v 1 1 0
v 5 1 0
v 5 5 0
v 1 5 0
v 3 3 5
v 1 1 10
v 5 1 10
v 5 5 10
v 1 5 10
9
f 3 4 3 2 255 255 0
f 3 4 2 1 255 0 0
f 3 4 1 0 0 255 0
f 3 4 0 3 0 0 255
f 4 0 1 2 3 100 100 100
f 3 4 8 7 255 255 0
f 3 4 7 6 255 0 0
f 3 4 6 5 0 255 0
f 3 4 5 8 0 0 255
f 4 5 6 7 8 0 255 255

What rules are to be respected to correctly compile the points and the lines (that delimits the faces) in the 3da file?

any advise is welcome

thanks

Edited April 27, 2014 by PincoPanco

[minxomat]

Well 3DA is a proprietary format. It was just made for this script. While it may share some features with OBJ or other plain ASCII/ANSI model formats, I'm not aware of any 3rd party software using this. The format is only usable with convex objects and objects with no hole. You can get it to work, but there are some serious flaws in the format definition resulting from unnecessary code in the parser itself.

Due the fact that i won't maintain this weekend-project anymore, the format will not improve.

Here is the basic definition (Cube.3DA):

 

Your double pyramid model is correct in theory. What ruins it is the missing depth testing and background clipping in the engine itself. You can see the effect more clearly here (Knot.3DA):

Edited April 27, 2014 by minx

[James1337]

I made loader for .OBJ files for the GDI version of this script if anyone is interested. Click here (German only, sorry guys) for the function and the torus knot you can see in the screenshot above.

[Gianni]

Hi @Minx
thanks for the clarification (and for this nice script of course! )

Hi @James1337

hey!  your function to extract data from an OBJ file is really ok

I modified it a bit so to convert and save an OBJ file to an 3DA file
This is the draft script I came out by modifying your function

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PeekFile()

Func PeekFile()
    Local $sFile = FileOpenDialog("Select an obj file", "", "files (*.OBJ)")
    If @error Then
        MsgBox(0, "", "No file selected.")
    Else
        LoadOBJ($sFile, 255)
    EndIf
EndFunc   ;==>PeekFile

Func LoadOBJ($sFilename, $iColor)
    $output = FileOpen(StringTrimRight($sFilename, 3) & "3DA", 2) ; create output file
    Local $sData = StringReplace(FileRead($sFilename), @CR, "")
    Local $T1 = StringRegExp($sData, "(?m)^v (.+?)$", 3), $i, $T2, $j
    $VerNum = UBound($T1) - 1
    FileWrite($output, $VerNum & @CRLF)
    For $i = 0 To $VerNum
        $T2 = StringSplit($T1[$i], " ", 2)
        FileWrite($output, "v")
        For $j = 0 To 2
            FileWrite($output, " " & $T2[$j])
        Next
        FileWrite($output, @CRLF)
    Next
    $T1 = StringRegExp($sData, "(?m)^f (.+?)$", 3)
    $LineNum = UBound($T1) - 1
    FileWrite($output, $LineNum & @CRLF)
    For $i = 0 To $LineNum
        $T2 = StringSplit($T1[$i], " ")
        FileWrite($output, "f " & $T2[0])
        For $j = 1 To $T2[0]
            FileWrite($output, " " & $T2[$j] - 1)
        Next
        ; $iColor = 0xRRGGBB
        FileWrite($output, " " & BitShift($iColor, 16) & " " & BitAND(BitShift($iColor, 8), 0xFF) & " " & BitAND($iColor, 0xFF) & @CRLF)
    Next
    FileFlush($output)
    FileClose($output)
EndFunc   ;==>LoadOBJ

here two examples of 3D models

Autoit string in 3d (this stops rotating after few seconds, anyway here it is...)

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a 3d sphere

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91
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179
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for those interested I can describe how I have easily created these two 3d examples:

• download this simple freeware program http://www.wings3d.com
• create your 3d model using it
• Use the File -> Export -> WaveForm (. obj) ... to save the file
• using the above script to convert the saved file from OBJ to 3DA
• use the converted file with the script of MR. Minx

Thanks again

bye