Question

Painting a color(or texture) at runtime on Zylann HeightMap Plugin

Comments

Is it possible?!
I found hterrain_brush.gd file for painting functions, I instanciate that and call paint method, but I get Assertion Failed error.

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It is possible (even without brush), but I never tested using the brush in game and maybe it's not exactly fit to your needs. Which error are you getting?

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I use these two line for painting a color on terrain, but I get "Assertion Failed" on hterrainbrush.gd Line 536. It seems CHANNELCOLOR is not loaded or accessible that momemt.

var brush = preload("res://addons/zylann.hterrain/hterrain_brush.gd").new()
brush.paint($HTerrain, collsioin_info.position.x, collsioin_info.position.z, brush.MODE_COLOR)

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Looks like only the heights can be accessed at runtime, actually. Colors are not because most of the time it is not really needed so no point wasting a large amount of memory.

I need to add an option somewhere to make it so channels stay in memory at runtime.
At the moment, if want to access it, I think you should comment out the if located in hterrain_data.gd line 1077: https://github.com/Zylann/godot_heightmap_plugin/blob/30f0e6022903825aef2b006e5abb97065668ec49/addons/zylann.hterrain/hterrain_data.gd#L1077

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Another error on hterrain_brush.gd Line 283 occured.
Invalid call. Nonexistent function 'get_width' in base 'Nil'.

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The brush doesn't initialize its shape by default. You need to specify it by calling set_radius(radius in pixels).

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Thanks Zylann! Finally It works!
For someone who read later, after commenting if located in line 1077 of hterrain_data.gd with following lines we could paint terrain at runtime.

var brush = preload("res://addons/zylann.hterrain/hterrain_brush.gd").new()
brush.set_color(Color.red)
brush.set_radius(10)
brush.paint($HTerrain, collsioin_info.position.x, collsioin_info.position.z, brush.MODE_COLOR)

I think if you add an option somewhere for loading channels to memory at runtime (so does not need to change addon source files), It could be a good temporal solution for https://godotengine.org/qa/49476/apply-objects-movement-effect-on-terrain (more specific on texture painting)

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Good to hear it works fine :)
However careful with the other question you linked, modifying the terrain to leave skidmarks is extremely expensive. Decals or simple mesh strips are often preferred to do this.

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Would you please give me some link or resources about them?
I found this https://github.com/Mr-Slurpy/Screen-Space-Decals, but I don't know how actually its works., and are its known limitations serious or not?

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I never used this in Godot yet, so I don't know more than you do.

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Anyway very thanks Zylann!

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hi Zylann, ive got a similar problem:
How can i modify the terrain while runtime?

Answer 1

Comment the if which is located in line 1077 of hterrain_data.gd and then use following lines:

var brush = preload("res://addons/zylann.hterrain/hterrain_brush.gd").new()
brush.set_color(Color.red)
brush.set_radius(10)
brush.paint($HTerrain, collsioin_info.position.x, collsioin_info.position.z, brush.MODE_COLOR)

For more info read above comments.