View Full Version : Bitmap Transform

12-03-2008, 12:03 PM
Hi everybody,

I have 2 little questions about bitmap transform.

Is it possible to desaturate a bitmap by MaxScript ?

Is it possible to blur a bitmap by MaxScript ?

It's because i use a script to make a virtual viewport, and i render my actual viewport as a bitmap to it, and i want to see it in greyscale or blured (for lighting is cool to have this vision).



12-03-2008, 12:38 PM
are you using max 2008 or up? you can just use a color correction map in the environment map slot. you can perform many image adjustments and this will show up in vpt background.

12-03-2008, 12:40 PM
i'm using max 9....

That isn't for render but for realtime. I'm using directX shader with vertexColor in my scene.

Here is the script i'm using for duplicate my viewport :

rollout t "Virtual viewport" width:200 height:200
bitmap w "" width:200 height:200

fn virtualViewport =
w.bitMap = gw.getViewportDib()
--colors = getPixels w.bitmap [0,0] 200
--print colors

on t open do
registerRedrawViewsCallback virtualViewport

on t close do
unRegisterRedrawViewsCallback virtualViewport

on t resized size do
x = gw.getWinSizeX()
y = gw.getWinSizeY()
w.width = size.x
w.height = size.y
if size.x > x do
t.width = x
w.width = x
if size.y > y do
t.height = y
w.height = y

createDialog t style:#(#style_resizing,#style_minimizebox,#style_titlebar,#style_border,#style_sysmenu)

12-05-2008, 03:59 PM
Do you mean something like this?:

(0.3*pixelVal.x + 0.59*pixelVal.y + 0.11*pixelVal.z)

That will return a pixel's luma value. So just assign that value to pixelVal.x, pixelVal.y, and pixelVal.z and you've got a grayscale. Since you're doing this to a bitmap, remember to read entire rows of pixels at a time, as it is more than twice as quick as doing it one pixel at a time.

As for blurring, I'd assume some research on convolution algorithms would get you what you need.

12-05-2008, 06:25 PM
To do it in realtime, you would have to use Viewport shaders (scene shaders).
Max does support them, though they are poorly documented and don't always work.

But blurring and desaturate should be possible.

12-05-2008, 07:38 PM
Thanks for reply
I will try that handiklap

knees: what is scene shaders ?

12-05-2008, 07:49 PM
Utilities > More... > Scene Effect Loader.

This allows you to load DirectX Scene Effects, that effect the whole viewport. Max ships with a few samples to do various effects (\maps\fx\scene\).


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