Ru/Collision mesh: Difference between revisions

Revision as of 08:47, 2 March 2016

Сетка столкновений - простая 3D-модель, использующая физические взаимодействия. Иногда её называют моделью столкновений. После того, как объект C++ будет загружен в движок, создаётся модель, вершины которой привязываются к сетке.

Сетка столкновений невидима, и должна быть сильно проще видимых компонентов модели (см. две картинки справа). Недостаток точности незаметен, кроме того, что он не приводит симуляцию в ступор.

Пояснения

Сетки столкновений состоят только из выпуклых элементов: Чтобы создать вогнутую сетку, соберите отдельные выпуклые объекты, пересекающие друг друга (если необходимо), и скомпилируйте с помощью $concave. Каждая выпуклая часть бережно относится к ресурсам симуляции.
Все элементы столкновений должны быть изолированы: Там вообще может не быть никаких отверстий. Это условие вычисляется путём изучения нормалей вершин, поэтому все края должны быть гладкими. Если studiomdl говорит: "Model has 2-dimensional geometry" (модель имеет 2-х мерную геометрию) - вы сделали ошибку (или должны слегка уплотнить сетку).

Сглаживание

В этом разделе рассказывается о том, как создать сглаженную сетку столкновений в различных пакетах моделирования. Помните, что ни в одной выпуклой форме не должно быть отверстий.

Blender

In Object Mode, run the "Shade Smooth" operator on your mesh.
Remove the Edge Split modifier if you've added it for some odd reason.

Maya

Use the Combine command to combine every part into a single editable mesh.
Do NOT append edges or merge verticies after using the Combine command.
Set selection mode to Edges, then select all edges in your collision mesh, then click on the Normals menu and click Soften Edge.
Set up a very basic UVW map, such as an Automatic unwrap.

XSI

A collision mesh created in XSI 6.01. The reference mesh has been moved aside for visibility.

Select every part of the collision mesh and use Model -> Create -> Polymesh -> Merge to combine them into one object.
Use Render -> Get-> Property-> Geometry Approximation. In the Polygon Mesh tab, uncheck Discontinuity: Automatic. All hard edges on the model will disappear.
Apply a texture and a projection to the collision mesh. Anything will do.

3DS Max

Use the Attach function to combine every part into a single editable mesh. (optional)
Do NOT weld vertices together after using the Attach function. All objects within the mesh should be individually selectable using the "Select Element" option within the Edit Mesh modifier.
Select every element (in the mesh) individually and set them all to a different smoothing groups. If you work on a very complex model that requires more than 32 smoothing groups, you can create "additional smoothing groups" by combining them. For instance, an element set to smoothing groups 1 and 3 will be properly differentiated from elements set to smoothing groups 1 or 3.
Apply your model's material to the collision mesh with at least a basic UWV map.

SketchUp

Build a collision mesh out of one or more groups of faces. Each group must form a solid convex shape.
Smooth each edge in the group by selecting all the faces inside and then right clicking and selecting "Smooth/Unsmooth edges". Set the slider to the 180 degrees to smooth all edges.
Apply the same material to each face of the collision model. Note you must apply the material to each face, not the group as a whole.
Combine multiple groups of faces into a single component.
Set the axis of the component to the same as your reference model.

Lightwave

Build a collision mesh out of primitives such as boxes and cylinders. As noted above, make sure each primitive is entirely solid and a separate object.
Hit Q to add the mesh to a new surface, and give it a name.
In the Surface Editor (F5), select the new surface, and check the smoothing checkbox. Give it a smoothing threshold of 180.

Cinema 4D

Build a collision mesh out of primitives. Each group must form a solid convex shape.
Create a new Connect Object and drag every primitive into it.
Remove all tags from the primitives (Phong, Textures..) except the UVW tag.
Apply your model's material to the Connect Object and export as SMD.

См. также

Физика и рэгдоллы
$collisionmodel:ru - QC-команда для сетки коллижена без каких-либо подвижных частей
$collisionjoints:ru - команда для коллижен-мешей с наличием подвижных частей

@@ Line 17: / Line 17: @@
 ; Все элементы столкновений должны быть изолированы
 : Там вообще может не быть никаких отверстий. Это условие вычисляется путём изучения [[vertex normal|нормалей вершин]], поэтому все края должны быть гладкими. Если studiomdl говорит: "Model has 2-dimensional geometry" (модель имеет 2-х мерную геометрию) - вы сделали ошибку (или должны слегка уплотнить сетку).
+== Сглаживание ==
+В этом разделе рассказывается о том, как создать сглаженную сетку столкновений в различных пакетах моделирования. Помните, что ни в одной выпуклой форме не должно быть отверстий.
+=== Blender ===
+# In {{IconLabel|File:BlenderObject.png|Object Mode}}, run the "Shade Smooth" operator on your mesh.
+# Remove the {{IconLabel|File:BlenderModEdgeSplit.png|Edge Split}} modifier if you've added it for some odd reason.
+=== Maya ===
+# Use the Combine command to combine every part into a single editable mesh.
+# Do NOT append edges or merge verticies after using the Combine command.
+# Set selection mode to Edges, then select all edges in your collision mesh, then click on the Normals menu and click Soften Edge.
+# Set up a very basic UVW map, such as an Automatic unwrap.
+=== XSI ===
+[[Image:Xsicollision.jpg|thumb|A collision mesh created in XSI 6.01. The reference mesh has been moved aside for visibility.]]
+# Select every part of the collision mesh and use ''Model -> Create -> Polymesh -> Merge'' to combine them into one object.
+# Use ''Render -> Get-> Property-> Geometry Approximation''. In the '''Polygon Mesh''' tab, uncheck '''Discontinuity: Automatic'''. All hard edges on the model will disappear.
+# Apply a texture and a projection to the collision mesh. Anything will do.
+=== 3DS Max ===
+# Use the Attach function to combine every part into a single editable mesh. (optional)
+# Do NOT weld vertices together after using the Attach function. All objects within the mesh should be individually selectable using the "Select Element" option within the Edit Mesh modifier.
+# Select every element (in the mesh) individually and set them all to a different smoothing groups. If you work on a very complex model that requires more than 32 smoothing groups, you can create "additional smoothing groups" by combining them. For instance, an element set to smoothing groups 1 '''and''' 3 will be properly differentiated from elements set to smoothing groups 1 '''or''' 3.
+# Apply your model's material to the collision mesh with at least a basic UWV map.
+=== SketchUp ===
+# Build a collision mesh out of one or more groups of faces. Each group must form a solid convex shape.
+# Smooth each edge in the group by selecting all the faces inside and then right clicking and selecting "Smooth/Unsmooth edges". Set the slider to the 180 degrees to smooth all edges.
+# Apply the same material to each face of the collision model. Note you must apply the material to each face, not the group as a whole.
+# Combine multiple groups of faces into a single component.
+# Set the axis of the component to the same as your reference model.
+=== Lightwave ===
+# Build a collision mesh out of primitives such as boxes and cylinders. As noted above, make sure each primitive is entirely solid and a separate object.
+# Hit Q to add the mesh to a new surface, and give it a name.
+# In the Surface Editor (F5), select the new surface, and check the smoothing checkbox. Give it a smoothing threshold of 180.
+=== Cinema 4D ===
+# Build a collision mesh out of primitives. Each group must form a solid convex shape.
+# Create a new Connect Object and drag every primitive into it.
+# Remove all tags from the primitives (Phong, Textures..) except the UVW tag.
+# Apply your model's material to the Connect Object and export as SMD.
 == См. также ==

Ru/Collision mesh: Difference between revisions

Revision as of 08:47, 2 March 2016

Contents

Пояснения