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Lava Planet

Aug 8, 2013, 10:37 (This post was last modified: Aug 8, 2013 18:46 by Wendy Black.)
Post: #1
Lava Planet
Lava Planet - How I learned why my house keeps burning down.

Space Part II

If you miss it, part I can be found here.

Jump into GIMP and create a square image, I am working with 600x600 today.

[Image: rrm.png]

1. Filters --> Render --> Clouds --> Solid Noise...
Tilable is checked
X size = 8.0
Y size = 8.0

2. Duplicate the layer (Crtl+Shift+D) and add the Alpha Channel using Layers --> Transparency --> Add Alpha Channel.

[Image: 2wiq.png]

3. Working with the top layer, select Colors --> Threshold...
I am going to leave this default but you can play with the settings.
For example; The white is going to be pools of lava. Playing with the threshold will give you lakes or rivers.

[Image: crbq.th.png] [Image: a1nh.th.png]

4. Use Shift+O and click the White space then press Delete to clear. Crtl+Shift+A to select none.

5. Select the bottom layer and hide the top layer for now. On the gradients tab select the "German Flag Smooth" then Colors --> Map --> Gradient Map.

[Image: r695.png] [Image: sc0o.png]

[Image: hwij.png]

6. Now show the top layer and we can see the lava pools. Crtl+Shift+N to make a new top layer. On the new top layer Filters --> Render --> Lava...
Seed=10 (my default)
Size=30
Roughness=20
Gradient (default) or German Flag Smooth
Keep Selection is checked
Separate Layer and Use Current Gradient is unchecked

[Image: 3gbn.png]

7. Duplicate the layer (Crtl+Shift+D) and select Colors --> Threshold...
I use 50 for the low setting and 255 for the high end. Use the (Shift+O) and click the black space. Then delete the top LAYER.

[Image: f13f.png]

8. Now you should see all the lava rivers are selected on the top layer. Crtl+I to invert the selection. Choose Select --> Grow... 2 pixels. Crtl+I to invert the selection, press Delete to clear. Crtl+Shift+A to select none.

[Image: 09gr.png]

Ok now you have a map of your lava planet. This is what mine looks like in this tutorial. Don't worry if your map is different.

9. Merge all the layers. (Ctrl+M) Filters --> Map --> Map Object...
a) Options Tab
----Map to: Sphere
----Transparent Background and Antialiasing is checked.
----Tile Source and Create New Image are unchecked.
----Depth = 3 (default)
----Threshold = 0.25 (default)
b) Light Tab
----Type = Point (default)
----Color = e3ffa8
----X = -0.5 Y = -0.5 Z = 2.0 (defaults)
c) Material Tab
----Ambient = 0.3 (default)
----Diffuse = 1.0 (default)
----Diffuse = 0.5 (default)
----Specular = 0.0
----Highlight = 27.0 (default)
d) Orientation Tab
(defaults) Note: If you want the planet larger you can move it on the Z position but for this tutorial I would leave it alone for now.

[Image: l92j.png]

10. Now that we put it together we have to tear it apart. Filters --> Distorts --> Polar Coordinates...
----Circle depth percent = 100 (default)
----Offset Angle = 0 (default)
----Map Backwards, Map from top, and To polar are ALL unchecked.

[Image: kkyh.png]

11. Rotate the resulting layer, Layer --> Transform --> Rotate 90 degrees clockwise. Select a rectangle Rectselect (R key) Position X = 300, Y= 0 to Size X = 15, Y = 600 (remember I am working in 600x600 resolution).

[Image: p6p1.png]

12. Using the Blend Tool (L) Fill the selection from left to right with the German Flag Smooth. Crtl+Shift+A to select none.

13. Filters --> Distorts --> Wind...
----Style = Wind
----Direction = Left
----Edge = Leading
----Threshold = 10
----Strength = 30

[Image: u3.png]

14. Select a rectangle Rectselect (R key) Position X = 300, Y= 0 to Size X = 200, Y = 600 (I am working in 600x600 resolution). Filters --> Blur --> Gaussian Blur...
Up the Horzontal and Vertical to 10.0 and apply. Crtl+Shift+A to select none.

[Image: swao.png]

15. Rotate the resulting layer, Layer --> Transform --> Rotate 90 degrees counter-clockwise. Filters --> Distorts --> Polar Coordinates...
Circle depth percent = 100 (default)
Offset Angle = 0 (default)
Map Backwards and Map from top are unchecked.
To polar is checked.

[Image: oglp.png]

16. You can optionally save this and load the Space Part I, or copy/paste it into Space Part I as a new layer. Using the Move Tool (M) I placed my planet on the right side of the screen. Then Layer --> Layer to Image Size.

[Image: ie1b.th.png]

17. Crtl+Shift+N to create a new layer. Filters --> Light and Shadow --> Supernova...
----X = 400 Y = 300 (center of my image)
----Color = Red hex code:ff0000
----Radius = 20
----Spokes = 1
----Hue = 0

18. Another spot where you have to be creative. Filters --> Distorts --> IWarp...
I set the swirl to CCW (counter-clockwise) and increase the radius to 125. Then hold the cursor to the right of the super nova I drag down just a little. Then I do a CW swirl on another side. There is a reset if you want to start again.

Swirl Example

19. Move the new layer (M) to where you feel looks good to you. Using a white underlayer will help you see the planet flares more clearly. Using Free Select Tool (F) and the Fuzzy Eraser you can select your flare and dispose of the unwanted excess.

Edit: I found a better way to dispose of the excess pink of the flares by either selecting the color or the alpha (your choice, artistic license) Then Feather and Grow the selection as much or as little as you like. Ctrl+I and clear.

[Image: e8x.th.png] [Image: 4jjv.th.png]

In the end, you can make some real cool looking space scenes. Even if they are NOT scientifically correct to others.

[Image: 6coq.png]

I call this "Fire and Ice". See if you can make some planets too.

[Image: mhrd.png]
Kubuntu 12.04 - Guild Wars - Retired Paranormal Researcher
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Aug 9, 2013, 07:40
Post: #2
RE: Lava Planet
very cool, I like the glow swirl, it looks like those solar eruptions on the Sun! I'm inspired to make some planets using both maybe this weekend, busy friday.
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Aug 9, 2013, 23:29
Post: #3
RE: Lava Planet
I am looking into various way to make flares. One method uses "path/stroke fill" which would make it less of a random approach. But looks somewhat thin and lack luster to me.


.xcf  flare.xcf (Size: 149.91 KB / Downloads: 55)

[Image: mhrd.png]
Kubuntu 12.04 - Guild Wars - Retired Paranormal Researcher
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Aug 10, 2013, 15:11
Post: #4
RE: Lava Planet
Good method, cool flare, you might want to check out those lightsaber tutorials for another flare effect.

I found an good underwater lighting tutorial using zoom blur & cloud (you can find the link in my bio at the end light with slits the later posts)
that can achieve a straight flare like the red planet in your sig.
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