Mapping:What is a patch - Revision history

Flajeen: /* Tutorial */

2011-12-22T17:43:26Z

‎Tutorial

Rylius: /* Tutorial */

2011-12-04T12:41:03Z

‎Tutorial

Rylius at 12:38, 4 December 2011

2011-12-04T12:38:52Z

Rylius at 12:23, 4 December 2011

2011-12-04T12:23:28Z

Rylius: /* Tutorial (by postit, originally posted at urtjumpers.com forum) */

2011-12-04T12:22:47Z

‎Tutorial (by postit, originally posted at urtjumpers.com forum)

Rylius at 12:07, 4 December 2011

2011-12-04T12:07:11Z

Rylius: moved What is a patch to Mapping:What is a patch

2011-09-13T15:17:29Z

moved What is a patch to Mapping:What is a patch

Rylius at 15:17, 13 September 2011

2011-09-13T15:17:00Z

John: Created page with "Bezier Patches or "curves" are one type of Parametric Surface. A parametric surface is a surface with a shape defined by a set of parameters, so the shape of the surface can ch..."

2011-08-27T13:57:23Z

Created page with "Bezier Patches or "curves" are one type of Parametric Surface. A parametric surface is a surface with a shape defined by a set of parameters, so the shape of the surface can ch..."

New page

Bezier Patches or "curves" are one type of Parametric Surface.

A parametric surface is a surface with a shape defined by a set of parameters, so the shape of the surface can change depending on the values of the parameters.

For Bezier Patches in Quake 3, the parameter is the LOD, or Level Of Detail.

Patches in Quake 3 are rendered with triangles, so the curves must be 'tessellated' (subdivided) into a number of triangles.

The higher the LOD value, the more the curve is subdivided, and the more triangles are created in tessellation.

The LOD can be set to change with the viewer's distance from the Patch, decreasing as they get further away.

In Q3 "r_lodCurveError" controls how much the LOD changes with distance, and "r_subdivisions" fixes the maximum LOD for all curves.

A Patch is stored as a 2-dimensional matrix of points.

A 2-dimensional matrix is a table containing sets of values arranged in rows and columns.

Each point is stored as two sets of values.

One set contains the XYZ coordinates defining the location of the point in the 3-dimensional volume of the map.

The other set contains the UV coordinates defining the location of that point on the 2-dimensional area of the Shader.

One Patch can only have one Shader, for the same reason one brush face can only have one Shader.

@@ Line 27: / Line 27: @@
 One Patch can only have one Shader, for the same reason one brush face can only have one Shader.
-== Tutorial ==
+== Creating patches ==
 '''Note: By postit, originally posted at [http://www.urtjumpers.com/forum/viewtopic.php?id=595 urtjumpers.com forum]'''

@@ Line 32: / Line 32: @@
 The aim of this tutorial is to guide a mapper in creating curved walls using patches, as pictured below:
-[[File:patches_1.jpg]]
+[[File:patches_1.jpg|200px]]
 Creating a curved wall is about moving vertices into the right positions. I've tried to use pictures more than words to show this.
@@ Line 47: / Line 47: @@
 {{Info|If you can't texture the correct side of the patch, you need to invert the matrix: Menu -> Curve -> Matrix -> Invert}}
-[[File:patches_5.jpg]]
+[[File:patches_5.jpg|200px]]
 === Semi Circle ===

@@ Line 40: / Line 40: @@
 # Accept default settings (3 X 3)
 # Use x/y/z axis rotate or change view (CTRL+TAB) until you are viewing the patch edge on - it looks like a line.
-# Press V to enter Vertex Selection mode. Your screen should look like the image below. The vertices have been numbered. [[File:patches_2.jpg]]
+# Press V to enter Vertex Selection mode. Your screen should look like the image below. The vertices have been numbered.<br/>[[File:patches_2.jpg|200px]]
-# Drag vertices 3 and 2 as shown below. A quarter circle is achieved. [[File:patches_3.jpg]] [[File:patches_4.jpg]]
+# Drag vertices 3 and 2 as shown below. A quarter circle is achieved.<br/>[[File:patches_3.jpg|200px]]<br/><br/>[[File:patches_4.jpg|200px]]
 # Texture the wall. With the wall selected, press S to bring up the Surface Inspector and select "Natural" in the patch texturing section.
@@ Line 50: / Line 50: @@
 === Semi Circle ===
-# This time create a 5 X 5 patch mesh. [[File:patches_6.jpg]]
+# This time create a 5 X 5 patch mesh.<br/>[[File:patches_6.jpg|200px]]
-# Move the vertices as shown to create a semi circle. [[File:patches_7.jpg]] [[File:patches_8.jpg]] [[File:patches_9.jpg]] [[File:patches_10.jpg]]
+# Move the vertices as shown to create a semi circle.<br/>[[File:patches_7.jpg|200px]]<br/><br/>[[File:patches_8.jpg|200px]]<br/><br/>[[File:patches_9.jpg|200px]]<br/><br/>[[File:patches_10.jpg|200px]]
-# Texture and voila: [[File:patches_11.jpg]]
+# Texture and voila:<br/>[[File:patches_11.jpg|200px]]
 === Go Nuts ===
-# Create a 15 x 15 patch mesh. [[File:patches_12.jpg]]
+# Create a 15 x 15 patch mesh.<br/>[[File:patches_12.jpg]]
-# Arrange vertices to an interesting kidney shape. [[File:patches_13.jpg]]
+# Arrange vertices to an interesting kidney shape.<br/>[[File:patches_13.jpg|200px]]
 This gives the result shown in the picture at the top of this tutorial.
 [[Category:Mapping]]

@@ Line 27: / Line 27: @@
 One Patch can only have one Shader, for the same reason one brush face can only have one Shader.
-== Tutorial (by postit, originally posted at [http://www.urtjumpers.com/forum/viewtopic.php?id=595 urtjumpers.com forum]) ==
+== Tutorial ==
 The aim of this tutorial is to guide a mapper in creating curved walls using patches, as pictured below:

@@ Line 30: / Line 30: @@
 The aim of this tutorial is to guide a mapper in creating curved walls using patches, as pictured below:
-http://img26.imageshack.us/img26/8066/sc3small.jpg
+[[File:patches_1.jpg]]
 Creating a curved wall is about moving vertices into the right positions. I've tried to use pictures more than words to show this.
-Start With A Quarter Circle
+=== Quarter Circle ===
-http://img824.imageshack.us/img824/2601/30103152.jpg
+{{Info|If you can't texture the correct side of the patch, you need to invert the matrix: Menu -> Curve -> Matrix -> Invert}}
-. Drag vertices 3 and 2 as shown below. A quarter circle is achieved.
+[[File:patches_5.jpg]]
-http://img204.imageshack.us/img204/8466/64033911.jpg
+=== Semi Circle ===
-http://img692.imageshack.us/img692/6927/81779537.jpg
+=== Go Nuts ===
+# Create a 15 x 15 patch mesh. [[File:patches_12.jpg]]
-. Texture the wall. With the wall selected, press S to bring up the Surface Inspector and select "Natural" in the patch texturing section.
+# Arrange vertices to an interesting kidney shape. [[File:patches_13.jpg]]
 This gives the result shown in the picture at the top of this tutorial.
 [[Category:Mapping]]

@@ Line 1: / Line 1: @@
-{{Stub}}
+== General information ==
 Bezier Patches or "curves" are one type of Parametric Surface.
@@ Line 25: / Line 26: @@
 One Patch can only have one Shader, for the same reason one brush face can only have one Shader.
 [[Category:Mapping]]

← Older revision	Revision as of 15:17, 13 September 2011
(No difference)

← Older revision		Revision as of 15:17, 13 September 2011
Line 1:		Line 1:
		+	{{Stub}}
	Bezier Patches or "curves" are one type of Parametric Surface.		Bezier Patches or "curves" are one type of Parametric Surface.

Line 24:		Line 25:

	One Patch can only have one Shader, for the same reason one brush face can only have one Shader.		One Patch can only have one Shader, for the same reason one brush face can only have one Shader.
		+
		+	[[Category:Mapping]]