How to inherit Material (surface) from the "base group" using SUBGROUP{3} in GDL

[Mario Sacco]

I can't find a solution to inherit the material from the "base group" in GDL. 

The code I made, always attribuites to the cut polygons the material of the "tool group" 

I'd like to have the cubes inherit their own material

PEN 1

GROUP "A"
MATERIAL 5
BLOCK 1,1,1
ADDX 1.1
MATERIAL 4
BLOCK 1,1,1
DEL 1
ENDGROUP

GROUP "B"
MATERIAL 7
ADD .5,.5,.5
BLOCK 1,1,1
DEL 1


MATERIAL 6
ADD -.7,.5,.5
BLOCK 1,1,1
DEL 1
ENDGROUP


PLACEGROUP SUBGROUP{3} ("A","B",0,0,0,0)

[MF BIM · Accepted solution]

Hello @Mario Sacco ,

You need to input the materialId value in the 4th argument of the subgroup command. If you want each block to have its own material then you would need to have as many base groups and subgroup commands.

PEN 1
MAT_1 = 5
MAT_2 = 4

GROUP "A1"
	MATERIAL MAT_1
	BLOCK 1,1,1
ENDGROUP

GROUP "A2"
	ADDX 1.1
	MATERIAL MAT_2
	BLOCK 1,1,1
	DEL 1
ENDGROUP

GROUP "B"
	MATERIAL 7
	ADD .5,.5,.5
	BLOCK 1,1,1
	DEL 1

	MATERIAL 6
	ADD -.7,.5,.5
	BLOCK 1,1,1
	DEL 1
ENDGROUP

PLACEGROUP SUBGROUP{3} ("A1", "B", 0, MAT_1, 0, 0)
PLACEGROUP SUBGROUP{3} ("A2", "B", 0, MAT_2, 0, 0)

[Mario Sacco]

This solution is ok if I can separate the single objects.

My code include hundreds of objects with different colours and I need execute the subtraction only one.

As you can see the are many panels and the side cutted volumes have an incorrect surface.

I probably will try to use CUTPOLY for my problem, but for complex operation it can't work.

[MF BIM]

@Mario Sacco,

You could use arrays and iterate through them, maybe. Probably not very efficient but it'll work.

pen 1

NUM_BLOCKS = 4

dim names[]
dim mats[]
	mats[1] = 5
	mats[2] = 4
	mats[3] = 3
	mats[4] = 2

for NUM = 1 to NUM_BLOCKS
	names[NUM]	= "A" + str(NUM, 1, 0) ! A1, A2...

	group names[NUM]
		addx 1.1*(NUM-1)
		material mats[NUM]
		block 1,1,1
		del 1
	endgroup
next NUM

group "B"
	for NUM = 1 to NUM_BLOCKS
		material 6
		add -.7+(1.2*(NUM-1)),.5,.5
		block 1,1,1
		del 1
	next NUM
endgroup

for NUM = 1 to NUM_BLOCKS
	placegroup subgroup{3} (names[NUM], "B", 0, mats[NUM], 0, 0)
next NUM

[Mario Sacco]

This is the code using CUTPOLYA. It works fine but you can use only an extrusion as subtraction.

PEN 1
CUTPOLYA 11,1,0,
-1,-1,15,
-1,11,15,
11,11,15,
11,-1,15,
-1,-1,15,
1,1,15,
7,2,15,
8,7,15,
2,8,15,
1,1,15,
-1,-1,15

MATERIAL 2
BLOCK 4,10,1

ADDX 5
MATERIAL 3
BLOCK 5,10,1

CUTEND