question

Unfortunately the Fluid Level Display bar is hard coded to the grey color. However, by copying the draw code from the fluid object in the library, you can customize the color. Either place the following code directly in the On Draw Trigger of your object or create a User Command and call that from multiple objects. Be sure to return 1 at the end as this will cause the object to not draw its default level display.

fglPushMatrix();
glPushAttrib(GL_ENABLE_BIT);
fglDisable(GL_TEXTURE_2D);


double percentfull = 0;
if (getvarnum(current, "maxcontent") > 0)
	percentfull = getvarnum(current, "curcontent") / getvarnum(current, "maxcontent");
double red = getcolorcomponent(current, 1);
double green = getcolorcomponent(current, 2);
double blue = getcolorcomponent(current, 3);


double xlen = xsize(current) * getvarnum(current, "barsizex");
double ylen = ysize(current) * getvarnum(current, "barsizey");
double zlen = zsize(current) * getvarnum(current, "barsizez");
double barlen = zlen * percentfull;


// Scale the world to model space
fglScale(1 / xsize(current), 1 / ysize(current), 1 / zsize(current));


spacetranslate(getvarnum(current, "barlocx") * xsize(current), -getvarnum(current, "barlocz") * zsize(current), -getvarnum(current, "barlocy") * ysize(current));
spacerotate(getvarnum(current, "barrotx"), getvarnum(current, "barrotz"), getvarnum(current, "barroty"));


drawcube(0, 0, 0, xlen, ylen, barlen, 0, 0, 0, red, green, blue);
spacetranslate(0, 0, barlen);
drawcube(0, 0, 0, xlen, ylen, zlen - barlen, 0, 0, 0, 255, 255, 255); //Change the last three components to your desired RGB color
glPopAttrib();
fglPopMatrix();


return 1;