This page is a part of the Custom Track Tutorial. Back to the main tutorial page.
Track scale (track size) is an important topic for Custom Track authors. A track that is scaled too small will make players hit corners on turns and complete the course too quickly. An over-scaled track will be boring and take ages to complete. Picking the right scale early is important. It takes far more time and effort to change a track's scale when the track is close to completion than it does in the early stages of the project.
Scale Factors and Percent
This article uses scale factors and percent numbers. Multiply a scale factor by 100 to get the percent value.
- Factor 1.2 == 120%
- Factor 0.8 == 80%
It is up to the creator to decide his or her preferred unit so as long as they are consistent all the way through the custom track creation process. Most modeling programs use SI (Metric) units by default. It is much easier to calculate scale changes and make measurements with SI units than English measurements (inches and feet). Therefore, it is a good practice to use meters.
It is highly recommended for SketchUp users to use the Simple Meters template. If SketchUp normally starts with a template using English measurements, set the Simple Meters template as the default template for new projects. Click on Window > Preferences then click on Template and select Simple Template - Meters from the list and press OK. 3ds Max starts up unit-less by default.
Choosing a Scale
Note: These recommendations are for SketchUp. Scaling factors may be different when using other 3D editors.
A good scale for the width of a road can range anywhere from 2000m to 4000m across. Narrow sections shouldn't be much less than 1500m across. Your road should be at least 3000m wide at the starting line to accommodate player starts. This all very flexible because the road width is influenced by many factors, including:
- Length of straightaways
- Angles of turns
- Angles of slopes
- The presence of off-road or guard rails
- Boosts and Jumps
- Boosts from nearby item boxes
- Intended difficulty
- "Natural" roads (dirt roads) can vary widely in width.
- "Artificial" roads (streets, corridors) will have fixed widths through much of the course.
Avoid making long stretches of narrow roads without any wide sections; this can lead to problems when players fall off the track. Respawn points need to be placed on wide sections of track because when more than one player respawns at the same time, the additional players spawn to the left or the right of the respawn point. If there is no track below the player, they will be picked up by Lakitu and dropped over and over again.
It's a good idea to compare your track's scale to other custom tracks, especially if this is your first track. Many custom track models are available to download from the Google 3D Warehouse.
Inside vs Outside Drift
Mario Kart Wii vehicles have different handling characteristics. There are two main categories, vehicles that use outside drift (all karts and 9 bikes) and ones that use inside drift (Mach Bike, Flame Runner and 7 other bikes). Some turns that might be easy when using one type might be overly difficult with another. Therefore you should test your track with a variety of vehicles at different speeds to determine if your scale works for everyone.
To change your track's scale, you have the following options:
- Re-scale your model in your 3D editor. In SketchUp, this means using the Scale Tool. First you should mark the zero point before scaling so you can recenter it afterwards. Then highlight the entire track and choose Scale from the Tools Menu. This is usually the best choice while you are still editing the model, and before you have finished the KMP.
- You can also adjust the scale when importing your model into CTools, but it is not recommended to do this by extremely high values because it may mess up texture mapping. Adjusting the scale this way will let you use your old .obj file.
- Use Wiimms SZS Tools to automatically scale the whole track. This includes the course model, vrcorn model, KCL, minimap and all KMP points. For more information see Track Transformation. This is usually the best choice when the level is complete.
- Use SZS Modifier by going into the course_model MDL0, add a Matrix. Now create a new KCL using the same tool, and update your minimap, and KMP.
Scaling the entire model is not the only option. Sometimes it is better to change the width of roads or the angles of turns, especially if only certain parts of the track are problematic.
After altering your model in your 3D editor, you will also need to edit your collision model to generate an updated KCL, update your minimap and your KMP.
To calculate the scale of a track, first import the track into 3ds Max and export the model as a .3DS file into Sketchup. Next, measure the width of the road with the "Tape Measure Tool", and then, use the following formula to calculate the percentage to multiply your model by in 3ds Max.
w*x=s w= Width of current track x= Percentage to multiply track by s= Desired width of track (Usually 2500 near the finish line to accommodate starting)
When you plug in your variables, the equation should look like this:
57.15 (Current scale of track)*x=2500 (Desired scale of track)
Next you solve for x:
Multiply x's value by 100:
This is your percentage to multiply your track by to achieve your desired scale. (Tutorial by Pointy Pighead Games)
Recommended Scales for Retro Tracks
These recommended scales are not definitive. When possible, comparisons with Mario Kart Wii's retro tracks were made to determine the scale used by Nintendo. In other cases, the values listed here were arbitrarily made by custom track authors.
Note: Scaling factors may be different when using other 3D editors.
Mario Kart Games
|Super Mario Kart|| Assuming that 1 pixel is 1 game unit:
|Mario Kart 64|
|Mario Kart: Super Circuit|| Assuming that 1 pixel is 1 game unit:
|Mario Kart: Double Dash!!||
BCO files converted to OBJ using MKDS Course Modifier have to be additionally multiplied by 7.5.
|Mario Kart DS||
NSBMD files converted to OBJ using MKDS Course Modifier have to be additionally multiplied by 16.
|Mario Kart 7||
|Mario Kart 8|| For the models submitted by Ray Koopa to The Models Resource:
|Diddy Kong Racing|
|F-Zero (SNES)||The scale for White Land I and Big Blue was determined by measuring recharge lanes and narrow sections of track (80 pixels) and giving them a value of 2,000 game units. That works out to 25 game units per pixel. Smaller scales, such as 20 game units per pixel would be acceptable for many tracks, since the tracks vary in size.|
|LEGO Racers (N64)||1,600,000 (when importing the VRML into MeshLab, exporting as 3DS, and then importing into SketchUp)|
|Sonic Adventure (DX)||A scale factor of 20 was used in SADX Twinkle Circuit|
|Super Mario 64|
Introduction – Textures – Scale – Modeling – BRRES: CTools – BRRES: BrawlBox
Minimap – Solidity – KCL: Wiimms Tools – KMP Editing – Object Editing
Cameras – Cannons – Post-effects – Videos