Part 1 - Setting up your work panel
This isnt just for this tutorial. Starting off on the right way can really help you save time and make it easier to do big and/or complex scenes. Get rid of any menu that you dont need. This means everything except the history menu, layers menu and toolbar.
Background
Make a new file with size 300x400. Select transparent background. Because we want to make a grey building, we will be working with a lot of light grey colors. The best thing to do is choose a background color that contrasts the color you use most in your creation. I generally like to work with a green background. So for our convenience, choose RGB 88, 188, 86 as a background color.
Some extra lines
When you make tiles, walls, etc. Its always usefull to have a line somewhere up for grasps. So grap the pencil tool and make a black line as shown on image 1. When youre done, copy it and flip it horizontally (Edit > Transform > Flip Horizontal). Name these layers line 1 and line 2.
Guidelines
Guidelines are especially useful for bigger, more complex scenes. Make a red line in iso style, thus two pixels to the side and one pixel up, you know the drill. If you dont, take image 2 as an example.
After you did this, set the opacity to around 35%. I also like to name this layer, as you frequently need it. You can copy this one and flip it vertically, so you have two different guidelines. They come in handy for transparent objects aswell.
Two views
It can become quite a burden to zoom in, add a few pixels, zoom out to see if it looks good, zoom in to change something again etc. Therefore, its a lot easier to have two views in Photoshop, one with the actual size and one big view for zooming in. Go to view and click new view. Make the width as small as the layer menu. Place it directly above the layer menu on the right or left side of the screen. The other view will be used to zoom in so it needs to be as big as possible. Make sure the scroll bars on the side are still visible. Dont worry about the toolbar, it may overlap. Now you make optimal use of your monitor screen, and you wont be zooming in and out as much.
This is the end of the first part. You havent created anything yet but if you start and make big scenes you will find out that you can save a lot of time this way. There are probably a lot more different ways to set up your starting panel, but this is just how I do it.
Creating the shapes
Ok, now that we have everything on the right place lets get started.
Ground floor
First were going to determine the size of the building. Create the two lines and connect them as shown in the image 1. Color black. Make sure the middle line, where the two lines meet, consists of three pixels and not two like the rest of the line. We do this because a rectangle looks smoother that way. Do not do this when the rectangle is in a pattern, because then it doesnt look smooth anymore.
Roof
Its time for the roof. We want the building to have two stories. Copy the lines we made earlier and use the move tool. While moving the line upward, hold shift so the object wont move to the side.
Finishing the outline
Copy the top lines, the flip horizontally and vertically. Move it into place. Connect the roof with the bottom two lines by adding two vertical lines of one pixel width on the outside. Do the same for the middle, but choose a light grey color ( 232, 232, 232). Now we have the outline of a rectangle. We want to use the light grey color for all the inner outlines. Remember this because its very important, we can apply this to all the rectangular shapes. Copy one of the two sets of lines we made earlier.
Name the layer bricks. Make it invisible or move it away for now. Well get back to it later. Make the original layer light grey ( 232, 232, 232). To save time, select that layer and fill it. See what I told you earlier about backgrounds? The innerlines are hardly noticable now. But well stick with this for now.
Filling in the outline
Lets start to fill in the outline. A good idea is to copy the outline now, because we might want to make changes on it later. Put the copied layer on invisible. Select the original layer and grab the Paint Bucket. The sun will be somewhere on the right side, so choose an average grey ( 156, 156, 156) and fill in the right area. Use a darker value for the left side, because thats the shady side. I used RGB 111,111,111. The roof color must be a bit lighter than the right side. Now we have the average isometric shape.
Expanding
The building looks a bit boring as it is now, so lets expand it. The roof looks too flat, so lets make an inlet on top of it. Repeat Image 1, but cut of four pixels or two pieces at the ends. The outline we copied earlier comes in handy now, because we can use part of it for this. Place it directly on top of the light innerline, or the edge of the roof. Move it two pixels upward. Copy it and flip it vertically and horizontally. Copy the layer again. select one of them and fill in with the light grey: 232, 232, 232. Move the light grey one the same way as the first lines, but now two pixels down. As you can see, we have an abundance of the line so cut off two pixels on each end. Add a vertical black line of three pixels high in the corner. Merge the layers with the rest of the building. Those innerwalls need some color. Select the Paint Bucket and use the colors of the big outerwalls.
Expanding some more
It still looks a bit boring, so attach some other rectangles on it. You may repeat image 1 to image 4 for this, but use other sizes. Move the rectangles around untill you find a suitable spot for them. Lets make another inlet. we have to make a reversed rectangle. We have to cut out a small rectangle from the big one. Make the line as in image 1 but then small, around fourteen pixels in width. Move it to the corner with around the same height. The transparent red guideline comes in handy for this. Align it with the black top line of the small cube. You now know how high the inlet should be. Merge the line of the inlet with the building, and delete what's in between. Finish it off by adding pixels on the inside. Because there are new corners now, we have to make the lines light grey. After you're done merge the layers with the rest of the building.
Creating the shapes
Ok, now that we have everything on the right place lets get started.
Ground floor
First were going to determine the size of the building. Create the two lines and connect them as shown in the image 1. Color black. Make sure the middle line, where the two lines meet, consists of three pixels and not two like the rest of the line. We do this because a rectangle looks smoother that way. Do not do this when the rectangle is in a pattern, because then it doesnt look smooth anymore.
Roof
Its time for the roof. We want the building to have two stories. Copy the lines we made earlier and use the move tool. While moving the line upward, hold shift so the object wont move to the side.
Finishing the outline
Copy the top lines, the flip horizontally and vertically. Move it into place. Connect the roof with the bottom two lines by adding two vertical lines of one pixel width on the outside. Do the same for the middle, but choose a light grey color ( 232, 232, 232). Now we have the outline of a rectangle. We want to use the light grey color for all the inner outlines. Remember this because its very important, we can apply this to all the rectangular shapes. Copy one of the two sets of lines we made earlier.
Name the layer bricks. Make it invisible or move it away for now. Well get back to it later. Make the original layer light grey ( 232, 232, 232). To save time, select that layer and fill it. See what I told you earlier about backgrounds? The innerlines are hardly noticable now. But well stick with this for now.
Filling in the outline
Lets start to fill in the outline. A good idea is to copy the outline now, because we might want to make changes on it later. Put the copied layer on invisible. Select the original layer and grab the Paint Bucket. The sun will be somewhere on the right side, so choose an average grey ( 156, 156, 156) and fill in the right area. Use a darker value for the left side, because thats the shady side. I used RGB 111,111,111. The roof color must be a bit lighter than the right side. Now we have the average isometric shape.
Expanding
The building looks a bit boring as it is now, so lets expand it. The roof looks too flat, so lets make an inlet on top of it. Repeat Image 1, but cut of four pixels or two pieces at the ends. The outline we copied earlier comes in handy now, because we can use part of it for this. Place it directly on top of the light innerline, or the edge of the roof. Move it two pixels upward. Copy it and flip it vertically and horizontally. Copy the layer again. select one of them and fill in with the light grey: 232, 232, 232. Move the light grey one the same way as the first lines, but now two pixels down. As you can see, we have an abundance of the line so cut off two pixels on each end. Add a vertical black line of three pixels high in the corner. Merge the layers with the rest of the building. Those innerwalls need some color. Select the Paint Bucket and use the colors of the big outerwalls.
Expanding some more
It still looks a bit boring, so attach some other rectangles on it. You may repeat image 1 to image 4 for this, but use other sizes. Move the rectangles around untill you find a suitable spot for them. Lets make another inlet. we have to make a reversed rectangle. We have to cut out a small rectangle from the big one. Make the line as in image 1 but then small, around fourteen pixels in width. Move it to the corner with around the same height. The transparent red guideline comes in handy for this. Align it with the black top line of the small cube. You now know how high the inlet should be. Merge the line of the inlet with the building, and delete what's in between. Finish it off by adding pixels on the inside. Because there are new corners now, we have to make the lines light grey. After you're done merge the layers with the rest of the building.
Adding details
Since pixelart often has a lot of detail work, an additional part is devoted to this.
Windows
We'll begin with the details by adding some windows. We use the basic isometric approach again, which is two pixels to the side and one up. Make the basic window frame, as shown zoomed in image 13. Fill the frame with a dark brown color. Use the following values for this, ( RGB: 88, 56, 32) Fill the inside with a light blue ( RGB: 178, 232, 237). Now move this window somewhere in the corner of the big wall. Zoom in at around 800% on the window, and copy the window layer. Move the second window 6 pixels left so it comes next to it. Use the texture lines to align them correctly. Repeat these steps until you have 4 windows in a row on the second floor.
Add one window on the first floor.
Copy the window again, and flip it horizontally. Since the left side of the building is the shady side, the window should be darker. Go to Image " Adjust " Brightness/contrast and reduce the brightness to -20. Place the darkened windows on the shady wall.
Door
Make a door by using the same "method" we used for the window. Use a dark color for the outline. I filled the outline in with a drak grey color. Make the door around 18 pixels high and 8 pixels wide. Copy the door and move them both in place. Copy one again and flip it horizontally and reduce brightness with around 20. Move that one to the shady inlet wall, and remove the top part which would get "blocked" by the upper wall.
Antenna & Tube
Now I added an antenna and tube, to give it that typical industrial look. Just try for yourself whatever looks good. The results are shown in image 15.
Shadows
I always do the shadows at last, because then you actually have all the objects that cast a shadow. Since the roof is so dark, we will not place any shadows there. I always make the shadows with a straight horizontal line, on the shady side. An example is given in Image 16. So basically, the bottom line of the shadow is actually the inner white line but then 90 degrees rotated. The shadow color is black with an opactity of around 30%. The length of the shadows is often only one/third of the height of the object, but since I like to express this method more clearly, I have chosen for a longer shadow ( hey it can be sunset at that time!)
The end result, after applying all the shadows, is seen in image 17. Note that I usually do not restrict myself to one correct way of doing shadows. Basically, if it looks good I use it.
Finishing touches
The building is done, you may go on as long as you like, depending on how detailed you want it to be.
I actually went on a little bit more and added a parking lot with a couple of trees.
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