topic Re: Aligning a repeating texture to repeating elements in Libraries & objects

Aligning a repeating texture to repeating elements

TomWaltz — Tue, 24 Oct 2006 16:21:25 GMT

I'm trying to write a tile surround object that would physically model the tiles complete with grout lines.

Part of the goal is to align a photo-real texture to each individual tile (not always the same one, sometimes part of a pattern).

I'm banging my head against it since I am not having much luck aligning the origin inside the object, let alone finding a way to toggle between materials from tile to tile....

Aside from buying ArchiTile, any suggestions?

Re: Aligning a repeating texture to repeating elements

Djordje — Tue, 24 Oct 2006 16:22:59 GMT

TomWaltz wrote:
Aside from buying ArchiTile, any suggestions?

No.

You might want to build a hotrod yourself, but not a daily driver, right?

Re: Aligning a repeating texture to repeating elements

TomWaltz — Tue, 24 Oct 2006 16:46:22 GMT

Djordje wrote:
You might want to build a hotrod yourself, but not a daily driver, right?

It's sometimes cheaper in the long run to build one myself that does exactly what I need/want than buying and maintaining multiple licenses of a 3rd party product.

Re: Aligning a repeating texture to repeating elements

Frank Beister — Tue, 24 Oct 2006 17:05:55 GMT

I do not know if understand you right, but have you tried to allign each tiles origin by VERT, COOR and BODY?

Re: Aligning a repeating texture to repeating elements

TomWaltz — Tue, 24 Oct 2006 17:46:04 GMT

F. wrote:
I do not know if understand you right, but have you tried to allign each tiles origin by VERT, COOR and BODY?

Tried, yes. Succeded.... no.

I have not had much luck figuring out the relationship and usage of those three commands. I know there are a couple pages in the GDL manual, but I am struggling to make sense of them.

Re: Aligning a repeating texture to repeating elements

Anonymous — Tue, 24 Oct 2006 18:34:31 GMT

Hello Tom,
Do you have the GDL Cookbook 3 ?
DNC has a couple of pages explaining these commands.
Peter Devlin

Re: Aligning a repeating texture to repeating elements

Frank Beister — Tue, 24 Oct 2006 19:07:10 GMT

Yes, they are described quiet well in the cookbook. Jochen is (hopefully in the moment ) working on the English edit pages of the selfgdl database, that I could translate some of the related parts. You have first to define 4 vertices by VERT. Then you activate them by COOR and close it by BODY to start the next alligning.

The four vertices are

X1/Y1/Z1 of the origin of the texture in space
X2/Y2/Z2 of the X-axis direction
X3/Y3/Z3 of the Y-axis direction
X4/Y4/Z4 of the Z-axis direction

The direction of the axis a viewed by the actual origin 0/0/0.

So the actual origin is
0/0/0
1/0/0
0/1/0
0/0/1

BASE

VERT 0,0,0  ! origin
VERT 1,0,0  ! X
VERT 0,1,0  ! Y
VERT 0,0,1  ! Z

COOR 2,   1,2,3,4

BODY -1

Re: Aligning a repeating texture to repeating elements

TomWaltz — Tue, 24 Oct 2006 19:20:55 GMT

OK, so those 4 allow you to set the origin and direction... how do you control scale/size?

Re: Aligning a repeating texture to repeating elements

Frank Beister — Tue, 24 Oct 2006 19:46:45 GMT

I haven't proofed, but I think with TEXTURE an a new MATERIAL for each scale.

Re: Aligning a repeating texture to repeating elements

David Collins — Wed, 25 Oct 2006 08:12:22 GMT

TomWaltz wrote:
OK, so those 4 allow you to set the origin and direction... how do you control scale/size?

If you have the Cookbook, look at the script for the ArchiDwight object pg 2.155, which uses TEXTURE and MATERIAL to control the size of the bitmap. Also, watch the BODY -1 statements in your script. There should be one just before the script for the target object and another just after the vert/coon statements.

Re: Aligning a repeating texture to repeating elements

Anonymous — Wed, 25 Oct 2006 12:16:15 GMT

With normal body creation you cannot have texture scaling as you like.
You can have a global change by defining the texture and stretching it, but it will be applied to all texture instances.

If you need to stretch the texture differently in many object you should create the body from scratch using teve commands. Its really very easy.

You can create a for loop to create complex objects. A sample code
just to create a vertical face

You need parameters mat (material) and x,y,z scale is to tweak the texture as you like. For tiles you will actually need just the upper surface so it is ultra simple. Just define points edges and a simple polygon

MATERIAL mat
BASE

TEVE 0,0,0, 0,0 ! origin
TEVE A,0,0, Xscale,0 ! P+u,v
TEVE A,0,ZZYZX, Xscale,Zscale ! P +u,v
TEVE 0,0,ZZYZX, 0,Zscale! Z+u,v

EDGE 1,2 ,-1,-1 , 0
EDGE 2,3 ,-1,-1 , 0
EDGE 3,4 ,-1,-1 , 0
EDGE 4,1 ,-1,-1 , 0

PGON 4,0,0, 1,2,3,4

BASE

TEVE 0,0,0 ,0,0
TEVE 1,0,0 ,0,0
TEVE 0,1,0 ,0,0
TEVE 0,0,1 ,0,0

COOR 2+1024, 1,2,3,4 !where code

BODY -1

Re: Aligning a repeating texture to repeating elements

Anonymous — Wed, 25 Oct 2006 15:54:21 GMT

Here is a more sophisticated example of texture alignment.

The gdl code creates a simple face. You can rotate it using the angle parameter.

You also have 3 hospots. The first one positions the origin of the texture
and the other two scale the texture graphically.

You can in fact use it to position textures in facades.

I wonder is it so hard to have such texture alignment in Archicad?

Its SOOOOO easy

Any comments welcomed. In fact i would like to add a few tricks to that simple gdl.

Re: Aligning a repeating texture to repeating elements

TomWaltz — Fri, 27 Oct 2006 14:01:33 GMT

OK, here's the code I tried:


	DEFINE TEXTURE "tilePattern" txtName, 
		txScale, tyScale,
		0, 0
	txtNum = IND(TEXTURE, "tilePattern")

	DEFINE MATERIAL "tilePattern" 24,
		1, 1, 	1, ! RBG Color
		0, 61, txtNum
	matlNum = IND(MATERIAL, "tilePattern")

! Draw Tile
	cPRISM_ 0, 0, matlNum,
				 5, ZZYZX,
			0, 0,     15,
			A, 0,     15,
			A, B,     15,
			0, B,     15,
			0, 0,     -1
	
! Set Texture Origin
	VERT 	0,		B,		0		! Origin
	VERT 	1, 		B, 		0		! X Direction
	VERT	 0, 		1,		0		! Y Direction
	VERT 	0, 		B,		1		! Z Direction
	COOR 2, 1, 2, 3, 4
	BODY -1

The material is definitely not starting at 0,0,0 (the lower left corner) like it's supposed to be,

Any other ideas? Or did I code something wrong?

Re: Aligning a repeating texture to repeating elements

Frank Beister — Mon, 30 Oct 2006 07:22:11 GMT

Hello Tom.

I can not test it in the moment, but I think, your vertices are wrong.

! Set Texture Origin
   VERT    0,      B,      0      ! Origin

If it should be at 0/0/0, why is there a B inside? The direction of he axis ...


   VERT    1,       B,       0      ! X Direction
   VERT    0,       1,      0      ! Y Direction
   VERT    0,       B,      1      ! Z Direction

is independent of the origin. They show the direction from local, not from texture origin, pointed by the 1st VERT. Your "direction" should be 1/0/0, 0/1/0 and 0/0/1.

I think your VERT-block should work with

   VERT    0,      0,      0      ! Origin
   VERT    1,       0,       0      ! X Direction
   VERT    0,       1,      0      ! Y Direction
   VERT    0,       0,      1      ! Z Direction

You can do some transformations before the VERT commands to bring origin and orientation of your coordinate system in the position you want.

Re: Aligning a repeating texture to repeating elements

TomWaltz — Mon, 30 Oct 2006 19:50:06 GMT

The intention of the "B" value was to move the origin a distance (B) in the Y-direction.

I thought that if my origin was 0,B,0 and the vector was 0,0,0, the material would be tilted.

Re: Aligning a repeating texture to repeating elements

Frank Beister — Tue, 31 Oct 2006 00:14:47 GMT

Tom, if it was not clearifying, you can send me the object and the pict. Would be much easier for me to help.

Re: Aligning a repeating texture to repeating elements

Anonymous — Thu, 02 Nov 2006 08:00:34 GMT

TomWaltz wrote:
OK, here's the code I tried:


	DEFINE TEXTURE "tilePattern" txtName, 
		txScale, tyScale,
		0, 0
	txtNum = IND(TEXTURE, "tilePattern")

	DEFINE MATERIAL "tilePattern" 24,
		1, 1, 	1, ! RBG Color
		0, 61, txtNum
	matlNum = IND(MATERIAL, "tilePattern")

! Draw Tile
	cPRISM_ 0, 0, matlNum,
				 5, ZZYZX,
			0, 0,     15,
			A, 0,     15,
			A, B,     15,
			0, B,     15,
			0, 0,     -1
	
! Set Texture Origin
	VERT 	0,		B,		0		! Origin
	VERT 	1, 		B, 		0		! X Direction
	VERT	 0, 		1,		0		! Y Direction
	VERT 	0, 		B,		1		! Z Direction
	COOR 2, 1, 2, 3, 4
	BODY -1

The material is definitely not starting at 0,0,0 (the lower left corner) like it's supposed to be,

Any other ideas? Or did I code something wrong?

! Set Texture Origin New
	VERT 	0,		B,		0		! Origin
	VERT 	1, 		B, 		0		! X Direction
	VERT	 0, 		1,		0		! Y Direction
	VERT 	0, 		B,		1		! Z Direction
	COOR 2+256, 1, 2, 3, 4  ! 256 is local coordinate system 
	BODY -1