Lua > Texture Baking > Dice

This tutorial explains how to do Texture Baking using Lua scripts.

The scene dice.sceng has two objects, DiceHP, a high resolution version of the dice, and DiceLP, a low resolution version of the dice for which the textures will be created.

Lua > Getting Started

Load the SceneEngine libraries:

require("gmt_lua")
require("sceng_lua")

Load the dice scene:

sceng.OpenScene( "scenes/dice.sceng" )

Set DiceHP and DiceLP as Lua variables:

dice_hp = sceng.GetNode( "DiceHP" )
dice_lp = sceng.GetNode( "DiceLP" )

Call the RenderParameters table to get a default set of rendering parameters.

rp = sceng.RenderParameters()

Turn on texture baking mode, and set the offset and prefilter values.

rp.do_texture_baking = true
rp.ray_offset = 5.0
rp.prefilter_size = 5.0

Set the filenames of the texture elements that the raytracer will save.

rp.output_file = "scenes/dice_complete.tga"
rp.diffuse_file = "scenes/dice_diffuse.tga"
rp.normals_file = "scenes/dice_normals.tga"
rp.wire_file = "scenes/dice_wire.tga"

Texture size and antialiasing:

rp.width = 512
rp.height = 512
rp.samples = 2

Set the target node as DiceLP and the uvw mesh id as 0.

rp.target_nodes = {}
rp.target_nodes[1] = dice_lp
rp.target_uvw_ids = { 0 }

Set the source node as DiceHP.

rp.source_nodes = {}
rp.source_nodes[1] = dice_hp

And render the scene:

sceng.Render( rp )

These are the resulting images:

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