How to effectively reduce 3D model Z height without loss of details

Overview

This video demonstrates techniques for reducing the Z-height of a 3D model in Vectric Aspire while preserving surface detail. It compares four methods: direct flattening, the Emboss tool, manually cutting the model into sections and adjusting base/shape heights, and using an external tool called Pattern Sculptor.

Steps

1. Import the 3D model and position it on the left side of the workspace. Note the original Z-height (example: 9 inches).

2. Method 1: Flatten using Shape Height

   • Duplicate the original component and rename it.
   • Select the duplicate and progressively lower the Shape Height in the Component Properties.
   • Continue reducing until the target Z-height is reached (0.5 inches).
   • Observe that detail is significantly lost at low Z-heights.

3. Method 2: Emboss Tool

   • Duplicate the original component and set its Component Property to Merge.
   • Select the duplicate and choose the Emboss tool.
   • Adjust the percentage until the resulting thickness is close to the target (0.5 inches).
   • Use smoothing to clean up the rugged appearance.
   • Adjust Shape Height in Component Properties if exact thickness is needed.
   • Compare the result with the flattened version.

4. Method 3: Cut Apart and Adjust Base/Shape Heights

   • Duplicate the original component.
   • Draw vectors to divide the model into five sections: hips, legs, shoulders, head, and shoe.
   • Select each vector + component and use the Cut tool to separate the model into individual components.
   • For each section:
     • Select the component and lower the Base Height to remove excess material.
     • Use Replace Below to delete material below the model surface.
     • Adjust the Shape Height to restore proportion and detail.
     • Repeat until the desired Z-height is achieved.
   • After all sections are adjusted, select all five components and Bake them together.
   • Inspect for holes or gaps between sections, especially when using small bits.

5. Method 4: Pattern Sculptor

   • Export the 3D model from Aspire.
   • Import it into Pattern Sculptor software.
   • Adjust the Z-height/thickness and apply smoothing/softening tools as needed.
   • Export the modified model and import it back into Aspire.

6. Compare final results

   • Flattened version at target Z-height.
   • Embossed version at target Z-height.
   • Cut-apart version at target Z-height.
   • Pattern Sculptor version at target Z-height.
   • Check which retains the most visible depth and clean detail.

Key Points / Warnings

• Shape Height alone reduces Z-height but flattens details, producing a poor result at low heights.
• Emboss retains more detail but can distort geometry; use with patience and smoothing.
• Cutting a model apart allows separate control of Base Height and Shape Height per region, preserving more dimensionality.
• Replace Below is critical after lowering Base Height — it removes unwanted material below the surface.
• There is no exact formula for Base Height / Shape Height values when cutting apart; it is a trial-and-error process.
• After baking combined components, check for holes or gaps — a small bit may cut into spaces between sections.
• Pattern Sculptor is an optional external standalone tool from Carve Right that can reduce Z-height while retaining significant depth/detail.
• The tutorial notes a common quiz result: the flattened version and cut-apart version may have the same thickness, but the actual visible depth differs depending on the method used.