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This tutorial will explain how to create a room in 3D using GIMP.
Step 1. Create new image 500x150, white background.
Step 2. Create a new transparent layer.
Step 3. Select the pencil tool, Circle 1x1 brush, and draw three lines something like in the picture. The trick to this is imagining what you want to make 3D and then drawing the outline. In this case we're trying to make a 3D room with two walls and a floor. Make sure you blur the lines with a Gaussian blur of 1 or 2 pixels. I didn't do this until later in the tutorial. If you look close you can find where I did it. Oops!
Step 4. Create a new layer, title it “floor". Select the Paths tool (B), and draw a path around the floor. Then select “Create selection from path".
Step 5. Select the gradient tool and make sure your foreground color is black. Make sure the gradient settings set like in the picture.
Step 6. Now fill the selection with a gradient from top to bottom.
Step 7. Create a new layer and title it “back wall", then create a selection using paths, and fill it from bottom to top.
Step 8. Create a new layer titled “right wall", selection for the right-side wall, and fill that from top to bottom as well, but at an angle. Make sure that there is an even amount of white space parallel to the line between the floor and right-hand wall. You may have to experiment a little bit to get it right.
Step 9. Merge the three gradient layers into one layer. Then apply a Gaussian Blur of 50 on the layer.
Step 10. Create a new layer, title it “color". Fill this layer with the dominant color that you want to use in your image, and then set the layer mode to Burn.
Step 11. Create another new layer and title this “floor pattern". Create a rectangular selection like in the picture, then fill it with a pattern of your choice. I chose one with a stone theme. Set this layer to Overlay.
Step 12. Now, select the Perspective tool (Shift+P) and grab the upper right hand corner of the box. Drag it to the point where the three panels/walls/floor meet. Now it should look like this.
Step 13. The back wall is the easiest of the three because all you have to do is select it with the rectangular tool and fill it with a pattern of your choice. Before that though, create a new layer and title it “back wall pattern". Create your selection, fill it with a pattern and set the layer mode to Overlay.
Step 14. Create a new layer and title this “right wall pattern". Make a selection like in the picture, fill it with your pattern of choice, and set layer mode to overlay.
Step 15. Now select the perspectives tool and drag the lower right-hand corner to the point where the three panels/walls/floor intersect. It should look something like this now.
To make the features of each panel stand out, duplicate the “floor pattern", “back wall pattern", and “right wall pattern" layers and set their modes to overlay, screen, dodge, or soft light depending on what you like. I set “floor pattern copy" to soft light, “back wall pattern copy" to dodge, and the right wall copy to burn. It's totally up to you, since it should look good to you.
Step 16. Do Alpha to Selection on “floor pattern", then create a new layer titled “floor clouds" above “floor pattern copy". Render solid noise.
Step 17. Now go to Layers -> Colorize and play with the setting until you get a color you like. I set the saturation to full. Set “floor clouds" mode to either hard light or dodge. I chose dodge.
Step 18. Repeat the last step for the back wall and the right side wall, making sure the solid noise is above the layer and layer copy. I set both back wall and right wall solid noise layers to hard light.
I changed the color on the floor because I didn't like the previous color. That's ok, all I did was redo the cloud layer to get a color I liked better.
Ok, now we're finished! You can add whatever you like to the image and tweak the settings. I think I made the color too dark, this tutorial works well with bright colors like orange, and so on.
There you have it! A 3D room! You can add a render for example to fill the space, or whatever you like.
Thanks for reading, I hope this tutorial is helpful!
