---
title: "VRayPtex"
canonical: "https://documentation.chaos.com/space/VMAX/113575832/VRayPtex"
format: markdown
---
This page provides information on the Ptex Map.

## **Overview**

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## **Parameters**

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## **Time**

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## **Gamma Correction**

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## > Macro (anchor)

**Notes**

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- More information about PTex is available here: [https://ptex.us/](https://ptex.us/)
- PTex files are strongly connected to the topology of a mesh. Therefore, any modifiers which change the topology (including TurboSmooth and MeshSmooth) break the rendering of the PTex texture. If you want to smooth the object, you can use the [VRayDisplacementMod](https://docs-chaos.atlassian.net/wiki/spaces/VMAX/pages/113585664) modifier with Subdivision Type and 0.0 for Displacement amount.
- When importing .obj files in 3ds Max for use with PTex textures, make sure that the **Retriangulate Polygons **option in the OBJ Import Options dialog is disabled.
- When using PTex textures for displacement, small cracks might appear along polygon edges because of slightly different filtering applied to the PTex texture on adjacent polygons. Setting the **Filter width** to 0.0 improves the situation, but causes the most detailed mip-map level of the PTex file to be loaded thus increasing the required memory.
- When using PTex textures for displacement, it might be necessary to adjust the **Texmap min **and **Texmap max** parameters of the VRayDisplacementMod modifier, especially if the texture has negative colors. Otherwise, the texture values might be clipped away.