I can't understand German, but there is something wrong going on with your texture size (it's size should be power of 2).
Here is how it should looks like, with proper code and proper texture size (64x64):

Code:
Code:
#include <acknex.h>
#include <default.c>

//

var voxel_size = 64; // hier fur den abstand ;) 

typedef struct VOXEL
{
	ENTITY * front;  // x-
	ENTITY * back;   // x+
	ENTITY * left;   // y+
	ENTITY * right;  // y-
	ENTITY * top;    // z+
	ENTITY * bottom; // z-
	
	
} VOXEL;


VOXEL * VoxelStructure[20][20][20]; // 2D array


void create_voxel()
{
	int x, y, z;
	
		
	for(x = 0; x < 6; x++)
	{
		for(y = 0; y < 6; y++)
		{
		 	for(z = 0; z < 6; z++)
	   	{ 	
		  	VoxelStructure[x][y][z] = sys_malloc(sizeof(VOXEL));
			
			VoxelStructure[x][y][z].front = ent_create("brick02.pcx" , vector(voxel_size * x + 32, voxel_size * y,  voxel_size * z), NULL); // seite erstellen
			VoxelStructure[x][y][z].front.pan = 180;// winkel setzen
			
			VoxelStructure[x][y][z].back = ent_create("brick02.pcx" , vector(voxel_size * x - 32, voxel_size * y, voxel_size * z), NULL); // seite erstellen
			VoxelStructure[x][y][z].back.pan = -180; // winkel setzen
			
			VoxelStructure[x][y][z].left = ent_create( "brick02.pcx" , vector(voxel_size * x, voxel_size * y + 32, voxel_size * z), NULL); // seite erstellen
			VoxelStructure[x][y][z].left.pan = 90; // winkel setzen
			
			VoxelStructure[x][y][z].right = ent_create( "brick02.pcx", vector(voxel_size * x, voxel_size * y - 32, voxel_size * z), NULL); // seite erstellen
			VoxelStructure[x][y][z].right.pan = -90;  // winkel setzen
			
			VoxelStructure[x][y][z].top = ent_create( "brick02.pcx", vector(voxel_size * x, voxel_size * y, voxel_size * z + 32), NULL); // seite erstellen
			VoxelStructure[x][y][z].top.tilt = 90;  // winkel setzen
			
			VoxelStructure[x][y][z].bottom = ent_create( "brick02.pcx", vector(voxel_size * x, voxel_size * y, voxel_size * z - 32), NULL); // seite erstellen
			VoxelStructure[x][y][z].bottom.tilt = 270;  // winkel setzen
	     }
	  }
	}
}


void main()
{
	wait(1);
	video_set(sys_metrics(0) * 0.75, sys_metrics(1) * 0.75, 0, 2);
	fps_max = 60;
	
	max_entities = 48000;
	
	level_load("");
		wait(1); // warten bis der level geladen ist, kann sonst probleme auf langsamen rechnern / gro?en leveln geben
	
	create_voxel();
}

Anyway, good luck.



Greets


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