Loading height maps and textures? #72
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This add-on is brilliant and most probably the best add-on I have ever seen for Godot! Well done! I am trying to build a terrain based on real world data, where I have a height map for the elevation, but also shape files for different types of terrain. For instance, one shape file for forest, one for fields and one for water. So, any idea how I can convert a red/black image to the resource file you are using for the zones? Best regards and thanks for the good work! |
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Replies: 2 comments 9 replies
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Hey @niklasking ! I'm so glad you enjoy what I've done! So, the whole system is based on heightmaps, as long as you have ImageTexture resource in Godot, you should be able to use it in the zones. I made a quick test here, I took a heightmap from new york (only the area with the squares) : and I made a script to convert the resulting image into 4 zones : Obviously my source image is not really precise but that gives you a picture of what could be done. This was just a quick test, but here's what I did to generate the zones images : public void Test() {
var heightmap = ResourceLoader.Load<Texture2D>("res://Tester/heightmap.png");
var image = heightmap.GetImage();
float factor = 10.0f; // Just a simple factor to increase height
// Generate 4 zones from the original image (the original image is 1080x1080 so each zones will be of 540)
/// The -1.3f is the minium height for this zone and the 106f is the maximum height for this zone
GenerateImageTextureForZone(image, 0, 0, 540, -1.3f, 106f, factor);
GenerateImageTextureForZone(image, 1, 0, 540, -1.3f, 106f, factor);
GenerateImageTextureForZone(image, 0, 1, 540, -1.3f, 106f, factor);
GenerateImageTextureForZone(image, 1, 1, 540, -1.3f, 106f, factor);
}
private void GenerateImageTextureForZone(Image image, int zoneX, int zoneY, int size, float min, float max, float factor) {
var newImage = Image.Create(size, size, false, Image.Format.Rf); // Create a RF image
var startingX = size * zoneX;
var startingY = size * zoneY;
for (var x = 0; x < size; x++) {
for (var y = 0; y < size; y++) {
var toX = x + startingX;
var toY = y + startingY;
var pixel = Colors.Black;
try {
pixel = image.GetPixel(toX, toY);
} catch {
// Throw an actual exception, this was just for testing
}
var heightValue = Mathf.Remap(pixel.R, 0f, 1f, min, max) * factor;
newImage.SetPixel(x, y, new Color(heightValue, 0, 0, 1f)); // Set the red channel value (we are on a RF image so only the red channel is relevant)
}
}
var imageTexture = ImageTexture.CreateFromImage(newImage);
ResourceSaver.Save(imageTexture, $"res://Tester/h_{zoneX}_{zoneY}.res"); // Save the image as a resource so we can use it in the zones.
}Does that make sense to you ? 🙂 |
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Hey @niklasking ! The objects are not done the same way, but godot already handles that for us! That should make it! |
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Thanks a lot! However, and sorry to trouble you, but something is strange when I generate trees (objects). It looks like the texture map/image is not considered and also, it looks like the object frequency is also not considered. |
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No worries, I'm always happy to help! For the object frequency, this property is used while painting, to determine how often we paint on the terrain. So it wont affect the objects when you place an image that is pre-generated. For the black spot you have there, from your splatmaps, it seems like you have at least 4 textures, because white would mean that you set 1.0 to all 4 channels of the image. If so, the splatmaps is telling the system to try to blend all 4 textures together, but they all have the same amount. I could be wrong but this is what I think from what I see here. Maybe you could try to paint on the terrain with the tool and see what kind of image it produces, it might help you 🙂. Your grass texture seems to be very pixelated, maybe try to generate the mipmaps for your textures (in the import panel, when selecting the image). I hope this helps! |
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Hi and thanks! /root/godot/modules/mono/glue/GodotSharp/GodotSharp/Core/NativeInterop/ExceptionUtils.cs:112 - System.NullReferenceException: Object reference not set to an instance of an object. Finally, is there any way to place the trees (objects) more separated even if I use my own map? The forest is right now very dense :-) I am so close now and once again thanks for the very good add-on and the brilliant support. Best regards, |
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Hum, that's really hard to tell without seing the project. Would you be able to share it with me (feel free to remove "sensitive" stuff, as long as I can reproduce the problem)? If so, you could upload it on something like "wetransfer". If needed, feel free to join my discord server, it might be easier to share it there : https://discord.com/invite/htktb7k For the density right now there is no way to do it without painting scape between the objects but this is something that could be done! Could you open an issue for that ? 🙂 |
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Hey @niklasking ! |
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Hey @niklasking !
I'm so glad you enjoy what I've done!
So, the whole system is based on heightmaps, as long as you have ImageTexture resource in Godot, you should be able to use it in the zones.
For the heightmap itself, I use the RF format (OpenGL texture format GL_R32F where there's one component, a 32-bit floating-point value.) so I can have somewhat precise values that goes over 255.
I made a quick test here, I took a heightmap from new york (only the area with the squares) :
and I made a script to convert the resulting image into 4 zones :
Obviously my source image is not really precise but that gives you a picture of what could be done.
This was just a quick test, but here's wh…