Hi,
I have a problem to create a 3d grid in P3D mode. the script as follow;

void drawGrid () {
//**drawing grid**
beginRaw(DXF, "confGrid.dxf");
stroke(255, 255, 0);
 for (int k =0; k < GSIZE[2]; k++) { //Z direction
  for (int i = 0; i < GSIZE[0]; i++) { //hor. direction
   line(minX + i * cellx,   minY,   minZ + k * cellz,     minX + i * cellx,   maxY,   minZ + k * cellz);}
     
 for (int j = 0; j < GSIZE[1]; j++) { //=vert.direction
   line(minX,   minY + j * celly,   minZ + k * cellz, maxX,   minY + j * celly,   minZ + k * cellz);}
 }
   
 for (int p = 0; p < GSIZE[1]; p++) {
    for (int q= 0; q < GSIZE[0]; q++) {
      line(minX + q * cellx,   minY + p * celly,   minZ, minX + q * cellx,   minY + p * celly, maxZ);
     }
   }
endRaw();  
}

Basically, it only consists of lines in 3 direction. unforunately, I only can export them in Opengl mode to dxf format with a minor shifting (275 units in X and Y axis, -476.3 units in Z axis). In P3D mode, the dxf file only have one level of grid.

Can anyone give advice ? many thanks.

BTW, I can display the ortho or camera view in P3D mode, but after change to opengl, it appears blank screen with only background colour. I have loaded the opengl library in the first line of my script and also define the parameter in size() function.

Thank again anyway.
Rick