let's just say I want to have a SOP that dumps an exr file.
Maybe it's, say, 1024 by 512, with 2 float image planes, and an 8-bit RGB image plane, maybe.

UT_Raster won't work.

IMG_Plane looks like it'll handle each plane, but, how do I wrap ‘em up and dump ’em to an exr?

You can do this with IMG_File and PXL_Raster eventually, though the first one encapsulates all the functionality you need afaik.

skk.

ps You don't have to bother with file format. Just create your rasters, add them in IMG_File and save it with any extension supported by Houdini.

thanks Symek! that got my toe in the door.
this is a bit verbose, but…. this works, if anybody needs to do this.

one odd thing- I cannot get a valid PXL_Raster with a PXL_FLOAT32 format and PACK_RGB packing. ? why? I do not know.

(I made use of UT_RGBA, obviously that will only work for C_Raster)


—————————————————————————-
IMG_Stat myStat;
myStat.setResolution(xres,yres);
myStat.addDefaultPlane();
myStat.addPlane(“inty”,IMG_INT32,IMG_1CHAN);
myStat.addPlane(“Norm”,IMG_FLOAT16,IMG_RGB);
myStat.addPlane(“small”,IMG_INT8,IMG_1CHAN);
IMG_File *newImg = IMG_File::create(“NEWFOO.pic”,myStat);

PXL_Raster C_Raster, inty_Raster, N_Raster, small_Raster;
C_Raster.setFormat(PXL_INT8);
C_Raster.setPacking(PACK_RGBA);
C_Raster.setRes(xres,yres);
C_Raster.init();
inty_Raster.setFormat(PXL_INT32);
inty_Raster.setPacking(PACK_SINGLE);
inty_Raster.setRes(xres,yres);
inty_Raster.init();
//N_Raster.setFormat(PXL_FLOAT32);
N_Raster.setFormat(PXL_FLOAT16);
N_Raster.setPacking(PACK_RGB);
N_Raster.setRes(xres,yres);
N_Raster.init();
small_Raster.setFormat(PXL_INT8);
small_Raster.setPacking(PACK_SINGLE);
small_Raster.setRes(xres,yres);
small_Raster.init();
cout <<“valid: ”<<C_Raster.isValid()<<address_Raster.isValid()<<loc_Raster.isValid();
cout <<N_Raster.isValid()<<type_Raster.isValid()<<endl;

UT_RGBA *CPixels = (UT_RGBA*)C_Raster.getPixels();
for (int x = 0; x < xres; x++)
{
for (int y = 0; y < yres; y++, CPixels++)
{
if(y<(yres*.5)){
CPixels->r = 100;
CPixels->g = 0;
CPixels->b = 100;
}else{
CPixels->r = 0;
CPixels->g = 100;
CPixels->b = 0;
}
}
}

UT_ValArray <PXL_Raster*> rasters;
rasters.append(&C_Raster);
rasters.append(&inty_Raster);
rasters.append(&N_Raster);
rasters.append(&small_Raster);
newImg->writeImages(rasters);