Gaussian Splatting DragDrop.fu

Gaussian Splatting DragDrop.fu

--[[--
Gaussian Splatting DragDrop - 2025-08-27

Overview:

This Resolve/Fusion add-on allows you to drag and drop .ply files into the Fusion nodes view.
An Irrealix GaussianSplatting OFX node is then added to the comp automatically. 
The PLY filepath information is then added to the "Model 1" section.

Installation:
1. Copy the "Gaussian Splatting DragDrop.fu" file into the Fusion user preferences "Config" PathMap folder.

Fusion Studio Install Location:

    Windows:
    %AppData%\Blackmagic Design\Fusion\Config\
    
    Linux:
    $HOME/.fusion/BlackmagicDesign/Fusion/Config\
    
    MacOS:
    $HOME/Library/Application Support/Blackmagic Design/Fusion/Config/


Resolve Studio Install Location:
    Windows:
    %AppData%\Blackmagic Design\DaVinci Resolve\Fusion\Config\
    
    Linux:
    $HOME/.fusion/BlackmagicDesign/DaVinci Resolve/Fusion/Config/
    
    MacOS:
    $HOME/Library/Application Support/Blackmagic Design/DaVinci Resolve/Fusion/Config/


2. Relaunch Resolve/Fusion.

--]]--

{
	Event{
		Action = 'Drag_Drop',
		Targets = {
			FuView = {
				Execute = _Lua [=[
-- Check if the file extension matches
-- Example: isIFL = MatchExt('/Example.ply', '.ply')
function MatchExt(file, fileType)
	-- Get the file extension
	local ext = string.match(tostring(file), '^.+(%..+)$')

	-- Compare the results
	if (ext ~= nil) and (fileType ~= nil) and (string.lower(ext) == string.lower(tostring(fileType))) then
		return true
	else
		return false
	end
end


-- Get the current comp object
-- Example: comp = GetCompObject()
function GetCompObject()
	local cmp = app:GetAttrs().FUSIONH_CurrentComp
	return cmp
end


-- Process a file dropped into Fusion
-- Example: ProcessFile('/Example.ply', 1)
function ProcessFile(file, fileNum)
	-- comp:Print('[GaussianSplatting]['.. fileNum .. '][File Drop] ', file, '\n')

	-- Check if the file extension matches
	if MatchExt(file, '.ply') then
		-- Accept the Drag and Drop event
		rets.handled = true

		-- Get the current comp object
		comp = GetCompObject()
		if not comp then
			-- The comp pointer is undefined
			comp:Print('[GaussianSplatting] Please open a Fusion composite before dragging in a .ply file again.')
			return
		end

		-- Lock the comp to suppress any file dialog opening for nodes that have empty filename fields.
		comp:Lock()

		-- Add the vTextFromFile node to the comp
		local node = comp:AddTool('ofx.com.irrealix.GaussianSplatting', -32768, -32768)

		-- Add a new undo history item
		comp:StartUndo('Add GaussianSplatting')

		-- Check for a nil on the node creation and the filename string
		if node and file then
			-- Add the PLY filename to the Model 1 section
			node.Model1_model = tostring(file)

			-- Expand the Model 1 collapsable section in the Inspector window
			node.Model1 = 1
		else
			comp:Print('[GaussianSplatting] Warning: Failed to update the model1 filename.')
		end

		-- Unlock the comp to restore "normal" file dialog opening operations
		comp:Unlock()

		-- Close off the undo history item block
		comp:EndUndo(True)
	end
end

-- Where the magic begins
function Main()
	-- Call other chained events and default action
	rets = self:Default(ctx, args)

	-- Debug print the args
	-- dump(args)

	-- Drop zone screen coordinates
	mousex = args._sxpos
	mousey = args._sypos

	-- No one else handled this?
	if not rets.handled then
		-- Get the list of files dropped onto Fusion
		files = args.urilist

		-- Scan through each of the files
		for i, file in ipairs(files) do
			-- Process a .ply file dropped into Fusion
			ProcessFile(file, i)
		end
	end

	-- Debug print where the file was dropped onscreen in the window (using screen coordinates)
	-- print('[Drop Zone Coords] [X] ' .. tostring(mousex) .. ' [Y] ' .. tostring(mousey) .. 'px')
	-- print('\n')
end

-- Run the main function
Main()
]=],
			},
		},
	},
}