Welcome to Vice City. Welcome to the 1980s.

Having just made it back onto the streets of Liberty City after a long stretch in maximum security, Tommy Vercetti is sent to Vice City by his old boss, Sonny Forelli. They were understandably nervous about his re-appearance in Liberty City, so a trip down south seemed like a good idea.

But all does not go smoothly upon his arrival in the glamorous, hedonistic metropolis of Vice City. He's set up and is left with no money and no merchandise. Sonny wants his money back, but the biker gangs, Cuban gangsters, and corrupt politicians stand in his way. Most of Vice City seems to want Tommy dead.

His only answer is to fight back and take over the city himself.

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If you have ever played GTA Vice City, you should know that some collisions on the map are incorrect. A collision mesh is an invisible copy of original model used to determine object's behavior when a player and/or other objects interact with it (touch it, step on it, shoot it, etc.). It can be simpler than the model, because mesh should only repeat the shape of the object. But sometimes simplification goes too far.

Perhaps it is not so important to do something about it. But in some cases it looks awful. Following picture shows inaccessible doors in a building near the North mall point.

Inaccessible doors


How to fix it? You can create or edit collision mesh manually. But there is another way. Collision can be extracted directly from the model (DFF file) of the object. Here's how you can quickly create a mesh with maximum precision.


Disclaimer

We're sure that there are simpler ways to do this. But this one allows you to:

  • Set surface materials for the new mesh (and sounds of touch);
  • Make a mesh as close as possible to the original model;
  • Learn something about the most useful modding tools for GTA Vice City (if you haven't before).

Also we know about ability of "Collision file editor" to extract collisions from DFF files. BUT. This tool can only extract attached collision. But it cannot make collision from model's vertexes (what we offer to do):

Unability of CollEditor to extract COL from DFF



What will we need?

You will need following tools (in order of use):

All these links are actual at 4.01.2020.


Algorithm

1.1. Launch "Moo mapper". Select GTA Vice City with these settings:

Moo mapper launch


1.2. In the list of placement files (IPL) check the map part that needed object refers to (it is nbeach.ipl in our case):

Moo mapper - map selection


1.3. Use the mouse to find needed object on the map. Select it by left double-click. Application will show three axes in the center of it and the settings window:

Moo mapper - object selection


1.4. Remember the model's name (it is nbdecoshop02 in our case) and the map part (nbeach). Close "Moo mapper".

2.1. Open file "models\gta3.img" using "IMGTool". Find DFF file with needed model's name (nbdecoshop02.dff) and COL file with map part's name (nbeach.col):

IMGTool


2.2. Right-click on each of them and extract them into one folder. Close "IMGTool".

Next three lines not needed since "qhull2cst" tool's version 1.4. But it supports not all versions of DFF. So tool can still be used to convert Qhull OFF text to CST script according to point 4.1.

3.1. Launch 3D object converter. Open extracted DFF file:

3.2. Save loaded model as "Qhull OFF (*.txt)". This operation will create TXT file with the name of needed model.

3.3. Close converter. Remember that this tool supports batch conversion that can be used for set of models.

4.1. Launch "qhull2cst" tool from command line (or make "Open with..." operation). Specify saved DFF file as a parameter. This operation will create DFFCST file (tool version 1.4).

4.2. Close command line after conversion. Remember that this tool supports automation too.

5.1. Open extracted COL file using collision editor. Find model's name:

ColEditor - old mesh


5.2. Export (by right-click) existing collision script (CST file) and remove it from model's list of COL file.

5.3. Rename exported CST file to BAK file, and DFFCST file to CST file.

5.4. Add (using F9 key) new CST file to collision editor:

ColEditor - new mesh


5.5. Turn on edit mode. On “Face” tab press "Select all" button. After that scroll down, find and press “Flip” button (not needed since "qhull2cst" tool's version 1.4).

5.6. Right-click on the model's name in the list and select menu "Target version → Col I". Close collision editor, save COL file.

6*. If you want to make your collision mesh more correct, reopen COL file, find new model and set correct materials for surfaces like windows or doors:

ColEditor - fixed mesh


7.1. Open "models\gta3.img", find old COL file. Delete it by right-click. Add (menu "Commands → Add") edited COL file.

7.2. Rebuild the archive (menu "Commands → Rebuild archive"). Close "IMGTool".


Well done! Now you have correct collision mesh for needed model!

Accessible doors


New Mission converted! Love&Bullets

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Progress time! As of 15.06.2019 another mission has been converted!

Shine o' Vice on ModDB / Demo Release!

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A small update for VRTP 1.5 with some txds i forgot to add on the archive and some updated txds and some fixes for wrong textures.

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Grand Theft Auto: Vice City
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Highest Rated (2 agree) 8/10

At least better than other GTA games.

Jan 6 2011 by Loki*

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